Method and device for transmitting uplink signal including control information via uplink channel

ES 2 525 555 T3

DESCRIPTION

Method and device for transmitting an uplink signal including data and control information through an uplink channel

The present invention relates to a method of transmitting an uplink signal including control information and data through an uplink channel.

Background of the technique

LTE Channel Structure and Association

The long-term evolution (LTE) link channel structure and association of the 3-year cooperation project will now be described.^to generation (3GPP). A downlink physical channel includes a downlink shared physical channel (PDSCH), a broadcast physical channel (PBCH), a multicast physical channel (PMCH), a control format indicator physical channel (PCFICH), a downlink control physical channel (PDCCH) and a hybrid ARQ indicator physical channel (PHICH). An uplink physical channel includes a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a physical random access channel (PRACH).

A downlink transport channel includes a broadcast channel (BCH), a downlink shared channel (DL-SCH), a paging channel (PCH), and a multicast channel (MCH). An uplink transport channel includes an uplink shared channel (UL-SCH) and a random access channel (RACH).

FIG. 1 illustrates an association relationship between a downlink physical channel and a downlink transport channel. FIG. 2 illustrates an association relationship between an uplink physical channel and an uplink transport channel. The physical channels and transport channels described above are associated with each other as illustrated in FIGS. 1 and 2.

Meanwhile, a logical channel classified as a control channel includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH ) and a dedicated control channel (DCCH). A logical channel classified as a traffic channel includes a dedicated traffic channel (DTCH) and a multicast traffic channel (MTCH).

FIG. 3 illustrates an association relationship between a downlink transport channel and a downlink logical channel. FIG. 4 illustrates an association relationship between an uplink transport channel and an uplink logical channel.

LTE slot structure

In a cellular orthogonal frequency division multiplexing (OFDM) packet radio communication system, an uplink / downlink data packet is transmitted in units of subframes.

A subframe is defined as a prescribed time duration that includes a plurality of OFDM symbols.

3GPP supports type 1 radio frame structure applicable to type 2 frequency division duplexing (FDD) and radio frame applicable to time division duplexing (TDD).

FIG. 5 illustrates type 1 radio frame structure. Radio frame type 1 consists of 10 subframes. A subframe consists of 2 slots.

FIG. 6 illustrates type 2 radio frame structure. Radio frame type 2 is made up of two semi-frames. Each half-frame consists of 5 sub-frames, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS). A subplot consists of two slots. The DwPTS is used for an initial cell search, for synchronization or for channel estimation. The UpPTS is used for channel estimation in an evolved Node B (eNB) and synchronization of transmission on the uplink of a User Equipment (UE). The GP is an interval to eliminate the interference caused by multipath delay of the downlink signal between the uplink and the downlink. That is, regardless of a radio frame type, a subframe consists of two slots.

FIG. 7 illustrates an LTE downlink slot structure. As illustrated in FIG. 7, a signal transmitted in each slot can be represented by a resource matrix composed of subcarriers and OFDM symbols. At this time, it indicates the number of resource blocks (RB) in a downlink, indicates the number of subcarriers that make up an RB, and indicates the number of OFDM symbols in a downlink slot.

ES 2 525 555 T3

FIG. 8 illustrates an LTE uplink slot structure. As illustrated in FIG. 8, a signal transmitted in each slot can be represented by a resource matrix comprising OFDM symbols and subcarriers. At this time, it indicates the number of resource blocks (RB) in an uplink, indicates the number of subcarriers that make up an RB, and indicates the number of OFDM symbols in an uplink slot. A resource element refers to a subcarrier and OFDM symbol as a resource unit defined by the indices (a, b) (where a is an index in a frequency domain and b is an index in a time domain) within uplink slot and downlink slot.

Meanwhile, the eNB transmits control information to a downlink to control a UL-SCH which is an uplink transport channel. The control information transmitted to the downlink informs the UE of the number of RBs transmitted through the UL-SCH and a modulation order. Furthermore, when the data is transmitted on an uplink, the control information informs the UE of a payload size of the data. The payload size can be defined as the sum of the size of the information (e.g. data size, or the size of the control information) transmitted from a media access control (MAC) layer and the cyclic redundancy check (CRC) size arbitrarily appended to information in a physical layer. The control information payload may not include the size of the CRC, because the CRC cannot append to the control information based on the size of the control information, before the CRC is appended to the control information. Specifically, if the size of the control information to which the CRC is not appended is less than or equal to 11 bits, the CRC is not appended to the control information. Also, if the size of the control information to which the CRC is not appended is greater than or equal to 12 bits, the CRC is appended to the control information.

Data and control information (eg Channel Quality Information (CQI) / Precoding Matrix Indicator (PMI) or Range Indication (RI)) can be multiplexed with each other and transmitted over the ULSCH. In the conventional system, a scheme for encoding the data differs from a scheme for encoding the control information. Furthermore, in the conventional system, a block error rate (BLER) of the data and a BLER of the control information, required by the eNB, may differ from each other.

Furthermore, in the conventional system, even though a data code rate is known using the modulation order, the number of RBs, and the payload size of the data, a code rate of the data information cannot be known. control. Furthermore, since the data and control information are multiplexed together and then transmitted through the UL-SCH, the number of transmitted symbols of the data cannot be known.

To solve such problems, the conventional system was updated such that the code rate of the control information is compensated for by an offset that can be changed by the eNB compared to the code rate of the data.

Even if the system is managed as described above, the code rate of the data can be varied with information multiplexed with the data. Also, if the data is not transmitted, the UE cannot estimate a CQI / PMI code rate, or a range indication, for example. Accordingly, a procedure is required to calculate a code rate of transmitted information (eg, CQI / PMI or range indication) according to a combination of information transmitted through the UL-SCH.

Furthermore, in the conventional communication system, if an error occurs in a data packet due to reception failure after the data packet is transmitted, the corresponding data packet is retransmitted.

Furthermore, in the case where retransmission occurs, if decoding is performed using an initially received data packet and a data packet received by retransmission, a probability of success in receiving the data packet is increased, even though they are not used. all resources used when the data packet is initially transmitted.

For example, when the communication system operates such that the initial data packet is transmitted error-free with a probability of 90%, the system does not encounter any problems even when the data packet is retransmitted at a code rate greater than a code rate of the initial data packet. Transmitting a data packet at a high code rate means that fewer physical transmission resources are used than during the initial transmission of the data packet.

If a CQI / PMI or range indication data rate is calculated, using the total number of symbols in the data when retransmitting the data packet, a code rate may not be determined to stably transmit the CQI / PMI or the indication rank. Therefore, when data is retransmitted, a code rate setting procedure is required to stably transmit the CQI / PMI or range indication.

In summary, in an attempt to save bandwidth when retransmitting, a base station instructs a conventional mobile to reduce the amount of total information bits (ie, data and control bits) that are retransmitted. This does not result in an increased error rate for the data bits, because the retransmitted payload data is combined by software with the original payload data. However, the corresponding control data of the two signals are not combined for decoding / modulation. That is, in the conventional system, the truncated control bits of the retransmitted signal are used for rate setting.

Code ES 2 525 555 T3, resulting in degraded performance. Thus, the present invention compensates for this degradation in performance by reusing the original control data in a novel way.

EP 0 944 199 A1 describes a method of generating a data sequence suitable for the transmission of variable length frames with variable length payload data in an environment where a code error may occur.

Description

Technical problem

If a CQI / PMI code rate, or range indication, is calculated using the total number of symbols of the data when retransmitting the data packet, a data rate may not be set to stably transmit the CQI / PMI or the indication of times. Therefore, when data is retransmitted, a code rate setting procedure is required to stably transmit the CQI / PMI or range indication.

In short, in an attempt to save bandwidth when retransmitting, a base station instructs a conventional mobile to reduce the amount of total information bits (ie, data and control bits) that are retransmitted. This does not result in an increased error rate for the data bits, because the retransmitted payload data is combined by software with the original payload data. However, the corresponding control data of the two signals are not combined for decoding / modulation. That is, in the conventional system, the truncated control bits of the retransmitted signal are used for code rate setting, resulting in poor performance. Thus, the present invention compensates for this degradation in performance by reusing the original control data in a novel way.

Technical Solution

Accordingly, the present invention is directed to a method and apparatus for transmitting first and second uplink signals, each having control data and information. The method is according to claim 1 and the apparatus according to claim 9. Particular embodiments are further defined in the dependent claims. The present invention is also directed to a method and apparatus for processing received signals, a first and a second, from the uplink, as set forth in claims 5 and 11, with particular embodiments further defined in the dependent claims.

The method for transmitting may include channel encoding of the control information of the second uplink signal based on a number of symbols of the control information to be produced. Channel coding includes determining the number of symbols based on a data payload size of the first uplink signal and a total number of transmittable symbols of a Physical Uplink Shared Channel (PUSCH) of the first uplink signal. uplink.

The determining step includes determining the number of symbols according to a payload size of the control information of the second uplink signal and an offset value applied to the control information of the second uplink signal.

Preferably, the method may further include channel encoding of the second uplink signal data to produce second channel encoded data; channel interleaving of the first and second channel-encoded data to generate the second uplink signal; and transmitting the second uplink signal.

Preferably, the number of control information symbols can satisfy the expression:

<img file="ES2525555T3_D0001.tif" />

<img file="ES2525555T3_D0002.tif" />

P,

<img file="ES2525555T3_D0003.tif" />

PUSCH RE

And data where M_x is the number of symbols of the control information,

N_x is the payload size of the control information, β x is the value of the offset,

Ndata is the data size of the first uplink signal,

MFF^sch is the total number of transmittable symbols of the Uplink Shared Physical Channel

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Preferably, the control information may be one of a channel quality control information and a range indication and the channel quality control information may include at least one of Channel Quality Information (CQI) and a Range Indicator. Precoding Matrix (PMI).

Preferably, the control information may be one of a channel quality control information and a range indication and the payload size of the channel quality control information includes a Cyclic Redundancy Check (CRC) size. attached to the channel quality control information.

Preferably the method may further include retrieving the payload size of the first uplink signal data and the total number of transmittable Physical Uplink Channel (PUSCH) symbols of the first uplink signal from a memory. or a cache.

The number of control information symbols satisfy the expression:

<img file="ES2525555T3_D0004.tif" />

Q '=

Q. PUSCH - initial

N

PUSCH - initial symbol β PUSCH displacement

<img file="ES2525555T3_D0005.tif" />

where

Q 'is the number of the control information symbols of the second uplink signal,

O is the payload size of the control information of the second uplink signal,

N_Simb^PUSCH~'ⁿ'^cial is a number of SC-FDMA symbols per subframe for Physical Uplink Shared Channel (PUSCH) transmission of the first uplink signal, M_sc^{p! JSCH}~^{! n! C! al} is the number of scheduled subcarriers representing a scheduled bandwidth of a PUSCH transmission for Physical Uplink Shared Channel (PUSCH) transmission of the first uplink signal.

zj PUSCH p offset is the offset value,

Cl '^ Kr is the payload size of the data from the first uplink signal, r is the number of r = 0 code block of the data from the first uplink signal before channel encoding the data of the first uplink signal, K_r is a number of bits in the code block number r and C is a total number of code blocks.

Also, there is a method and device for processing a received first and second uplink signal, each having data and control information. The method includes a channel decoding of channel coded data with a payload size of the data of the first uplink signal and a total number of transmittable symbols of a PUSCH of the first uplink signal to produce the information. control of the second uplink signal.

The channel decoding step includes a channel decoding of the channel encoded data with a payload size of the control information of the second uplink signal and an offset value applied to the control information of the second. uplink signal.

The number of control information symbols decoded in the decoding step satisfy the expression:

<img file="ES2525555T3_D0006.tif" />

N

PUSCH — initial symbol oPUSCH

Ct

Σ^κ.

Í = O where

Q 'is the number of the control information symbols of the second uplink signal,

O is the payload size of the control information of the second uplink signal,

ES 2 525 555 T3

N_Simb^PlJSCH-'ⁿ'^c'^{to the} is a number of SC-FDMA symbols per subframe for Channel transmission. Physical Uplink Shared (PUSCH) of the first uplink signal, Msc^PJSCH~'ⁿ^c'^{to the} is the number of scheduled subcarriers representing a scheduled bandwidth of a PUSCH transmission for Physical Uplink Shared Channel (PUSCH) transmission of the first uplink signal.

zj PUSCH p offset is the offset value,

C-1

Kr is the payload size of the data from the first uplink signal, r is the number of r = 0 codeblock of the data from the first uplink signal before channel encoding of the uplink data. the first uplink signal, Kr is a number of bits in the code block number r and C is a total number of code blocks.

When data and control information are transmitted by an uplink channel, an uplink signal including the data and control information can be transmitted by accurately calculating the code rates of the data and control information.

Description of the drawings

The accompanying drawings, which are included to provide a further understanding of the invention, and which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principle of the invention.

In the drawings:

FIG. 1 illustrates an association relationship between a downlink physical channel and a downlink transport channel.

FIG. 2 illustrates an association relationship between an uplink physical channel and an uplink transport channel.

FIG. 3 illustrates an association relationship between a downlink transport channel and a downlink logical channel.

FIG. 4 illustrates an association relationship between an uplink transport channel and an uplink logical channel.

FIG. 5 is type 1 radio frame structure.

FIG. 6 is type 2 radio frame structure.

FIG. 7 is an LTE downlink slot structure.

FIG. 8 is an LTE uplink slot structure.

FIG. 9 illustrates a processing of data and control information transmitted over a UL-SCH which is an uplink transport channel.

FIG. 10 illustrates an alternative processing of data and control information transmitted over a UL-SCH which is an uplink transport channel.

FIG. 11 is a subframe structure after the data and control information are multiplexed.

FIG. 12 illustrates an example of modulation constellation coordinates.

FIG. 13 illustrates an example of modulation constellation coordinates.

FIG. 14 describes the HARQ (Automatic Hybrid Replay Request) process to explain data retransmission.

FIG. 15 is a diagram explaining a usage relationship of a reference MCS during data retransmission.

FIG. 16 is a block diagram of a UE in accordance with an exemplary embodiment of the present invention.

FIG. 17 is a block diagram showing constituent elements of a device 50 which can be either a UE or an eNB.

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Optimal mode

Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention, rather than to show the only embodiments that can be implemented in accordance with the invention. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without such specific details. For example, the following description will be given focusing on specific terms, but the present invention is not limited thereto, and any other terms may be used to represent the same meanings.

FIG. 9 illustrates the processing of data and control information transmitted over a UL-SCH which is an uplink transport channel.

A CRC of the transport block (TB) is appended to the TB of data transmitted to an uplink in step S901. The data has to be multiplexed with control information (CQI / PMI or range indication). The data appended to the CRC is segmented into multiple code blocks (CB) according to the size of the TB in step S902, and a CRC of CB is appended to the CBs in step S903. Channel coding is carried out on CBs with appended CRC in step S904. The channel-encoded data is rate-matched in step S905 and the CBs are concatenated in step S906. The concatenated CBs are multiplexed with control information in step S907.

Meanwhile, a CRC is appended to the CQI / PMI in step S908, and channel coding is carried out on the CQI / PMI with CRC appended in step S909. The channel-encoded CQI / PMi is rate-paired in step S910 and multiplexed with the data in step S907. Although the channel coding process and the rate matching process are described as separate processes, the channel coding process may include the rate matching process in some cases.

The range indication is encoded per channel in step S911 separately from the data. The channel coded range indication is speed paired in step S912. Although the channel encoding process and the rate matching process are described as separate processes, the channel encoding process may include the rate matching process in some cases.

A channel interleaving process is carried out on the multiplexed data, the CQI / PMI and the range indication in step S913.

Channel encoding is performed on the acknowledgment (ACK) / negative acknowledgment (NACK) information in step S914, separately from the data, the CQI / PMI and the range indication.

The ACK / NACK information is inserted by puncturing a portion of the interleaved signal per channel. The interleaved signal in which the ACK / NACK information is inserted is transmitted to the uplink after physical resource association in step S915.

Channel-encoded data, CQI / PMI and range indication of specific sizes are converted to data, CQI / PMI and range indication with prescribed numbers of symbols or bits transmitted on a physical layer by rate matching. In this case, the number of symbols or bits transmitted in the physical layer should be present with respect to each of the data, CQI / PMI and range indication.

FIG. 10 illustrates an alternative processing of data and control information transmitted over a UL-SCH, which is an uplink transport channel.

Error detection is provided on the UL-SCH transport blocks through a Cyclic Redundancy Check (CRC) in step S100.

The entire transport block is used to calculate the parity bits of the CRC. The bits in a transport block delivered to layer 1 are indicated by ao, ai, a₂, a3, aA-i. Parity bits are indicated by po, pi, p₂, P3, ..., Pl-i. A is the size of the transport block and L is the number of parity bits.

The segmentation of the code block and the appending of the CRC to the code block are performed after the appending of the CRC to the transport block in step 110. The bits entered into the segmentation of the code block are indicated by bo, bi, b₂, b3, ..., bs-i, where B is the number of bits in the transport block (including the CRC). Bits after code block segmentation are indicated by cro, c_ri, cz, c_r3, ..., cr (Kr-i), where r is the code block number and K_r is the number of bits for code block number r.

Channel encoding is performed after segmentation of the code block and the code block CRC in step 120. After encoding, the bits are indicated by d ^ P, dri⁽ⁱ⁾, d ^, dr3⁽ⁱ⁾, .., dr (Dr-i)⁽ⁱ⁾, with i = 0, 1 and 2, and where Dr is the number of bits in the ith stream encoded for code block number r, that is, Dr = Kr + 4.

ES 2 525 555 T3

<img file="ES2525555T3_D0007.tif" />

<img file="ES2525555T3_D0008.tif" />

<img file="ES2525555T3_D0009.tif" />

Rate matching is carried out in Turbocoded blocks after channel encoding in step 130. After rate matching, the bits are indicated by e ^, e_ri, e_r2, e_r3, .... where res is the encoded block number, and where E_ris the number of bit rate-matched bits for code block number r.

Code block concatenation is performed after rate matching in step 140. The bits after code block concatenation are indicated by f₀, ñ, Í2, Í3,, fa-r, where G is the total number of bits encoded for transmission, excluding bits used for control transmission, when control information is multiplexed with transmission by UL-SCH .

The channel coding of the channel quality information is performed with the input sequence oo, Oí, o¿, .... 00-1 in step 150. The output sequence for the channel coding of the channel information channel quality is indicated by q₀, q-ι, qz qz, &lt;7qcg / -í · \_OR^RÍ i

The channel encoding of the Rl is done with the input sequence ^{1 0 J} or ^{1 0 1 J} at step 160.

'° 1 J and l 0 i J indicate, respectively, the 1-bit Rl and the 2-bit Rl.

[r ^ l

The channel encoding of the HARQ-ACK is performed with the input sequence » ^υ or

ACK io '⁷'·-!¹_on |_to Step 170. Each positive acknowledgment (ACK) is encoded as a binary '1' and each negative acknowledgment (NAK) is encoded as a binary Ό '. The HARQ-ACK can consist of 1 bit of fn^HERE 1 \ n^ACK OR^ACK] Or^ACK information, that is, ^{10 J}or 2 bits of information, that is, θ ¹ with ⁰ corresponding to the ACK / NACK bit for codeword 0, and corresponding to that of codeword 1. In addition, the HARQ-ACK and ^ ACK ^ ACK _ _ ^ ACK J can consist of more than two bits of information, namely, ^{0 1} or¹⁷* -! with O^ACK&gt; 2 [_θ sequence_to ¿Θ qf^K, qf^K.qf^K..... qf * ^ bits' ^ALK is obtained by concatenating multiple encoded HARQ-ACK blocks, where

Qackgs the total number of encoded bits for all encoded HARQ-ACK blocks.

The inputs to the data and control multiplexing are the coded bits of the control information, indicated by qo, qi, q2, q3,, qocQi-1, and the coded bits of the UL-SCH, indicated by f₀, fj, fz fz, fa-r in step 180. The output of the control and data multiplexing operation is indicated by g₀, 3i, 3z 33,, 3h-i, where H = (G + Qcqi) and Η '= H / Q_m, and where g¡, with /=0,...,/7-1, are column vectors of length Q_m. H is the total number of coded bits allocated for UL-SCH data and CQI / ΡΜΙ information.

Channel interleaving is performed with the output of the control and data multiplexing operation, indicated by gi, 3z 3s,, 3h-i, with the encoded range indication indicated by the qo, qi, q2, q3,, qocQi -1, and the HARQ-ACK ACK ACK ACK ACK indicated by ~^C~ ^ Qack-¹ .

The bits after the interleaving per channel are indicated by ^ Ά&gt; ^ 2 '-&gt; ^ ηκ7α / · ι □ number of modulation symbols in the subframe is given by H "= / 7' + Q'ri.

FIG. 11 illustrates a subframe structure after the data and control information are multiplexed. The subframe after the data, the CQI / ΡΜΙ, the range indication and the ACK / NACK information are suitably multiplexed into a physical layer, as shown in FIG. eleven.

Hereinafter , a method for calculating data code rates and control information when data is transmitted over a UL-SCH will be described.

When the data is transmitted simultaneously along with other information (e.g., at least one of the CQI / ΡΜΙ information and the range indication), since such control information transmitted along with the data is multiplexed along with the data After speed matching, the number of transmitted symbols of the data and the number of transmitted symbols of the transmitted control information together with the data are necessary for the data transmission. As used herein, "the number of symbols transmitted" means the number of symbols transmitted through speed matching. Therefore, in the present invention, "the number of transmitted symbols" is referred to as the number of symbols transmitted through speed matching.

Furthermore, in the present invention, a payload size can be defined as the sum of the size of the information (e.g., the size of the data, or the size of the control information) transmitted from a control layer of media access (MAC) and cyclic redundancy check (CRC) size arbitrarily appended to information in a physical layer. The control information payload may not include the size of the CRC, because the CRC may not be appended to the control information depending on the size of the control information before

It is 2 525 555 T3 that the CRC is appended to the control information. Specifically, if the size of the control information to which the CRC is not appended is less than or equal to 11 bits, the CRC is not appended to the control information. Also, if the size of the control information to which the CRC is not appended is greater than or equal to 12 bits, the CRC is appended to the control information.

If a code rate and modulation order of the transmitted data are exactly known, a reference Modulation and Coding Scheme (MCS) can be defined, using the code rate and modulation order of the data. An MCS of the transmitted control information along with the data can be estimated using the reference MCS and using offset information of the control information.

Assuming that the inverse of the spectral efficiency obtained by a code rate and a data modulation order is MCSdatos, MCSdatos can be calculated using the following Equation 1.

MCSdata ⁼_____________________________________

Code rate. Modulation Order

[Equation 1]

Yes MCS_ref is a reference MCS, Ncqi is a CQI / PMI payload size, and Acqi is a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a rate of CQI / PMI block errors and a difference between a data coding scheme and a CQI / PMI coding scheme, the number Mcqi of transmitted CQI / PMI symbols can be calculated using the following Equation 2.

M cqi

<img file="ES2525555T3_D0010.tif" />

<img file="ES2525555T3_D0011.tif" />

MCS_rcf

[Equation 2]

In Equation 2, state a maximum limit function. The upper limit function represents a function whose value is the smallest integer not less than a value within the symbol. For example, ^ 2,3 ^ is 3, because the smallest integer not less than 2.3 is 3.

Also, if MCS_ref is the reference MCS, Nri is a range indication payload size, and Ari is a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a rate block errors of a range indication, and a difference between a data encoding scheme and a range indication encoding scheme, The number Mr, of transmitted range indication symbols can be expressed by the following Equation 3.

m_ri =

AVIO '⁰ MCS_ref

[Equation 3]

If a code rate and modulation order of the data used in calculating a reference MCS are known, the number of transmitted CQI / PMI symbols and the number of transmitted range indication symbols can be calculated. However, if an eNB orders data transmission over a UL-SCH, the eNB informs a UE only of the total number of symbols that can be transmitted when the data and other information are multiplexed, a payload size of the data, and the order of modulation of the data. Therefore, the agreement between the eNB and the UE is required to calculate the reference MCS.

Example 1-A

As illustrated in FIG. 9, When the data, CQI / PMI and range indication are transmitted together, the data, CQI / PMI and range indication are speed paired and then multiplexed. To calculate the number of transmitted symbols from the data, the CQI / PMI and the range indication, equations of a complex closed form, or iterative equations, should be used.

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Therefore, a procedure is proposed to briefly calculate the reference MCS. However, if the procedure for calculating the reference MCS is simplified, an exact code rate of the information cannot be applied.

The procedure for calculating the reference MCS uses the code rate and the modulation order of the data under the assumption that only the data is transmitted over the UL-SCH without transmitting the CQI / PMI or the range indication.

Specifically, a referral code rate can be calculated using the following Equation 4.

Data

CRdata

Qdata · M_RE^PUSCH

[Equation 4]

Where CRdatos indicates a reference code rate, Ndatos indicates a payload size of the data, Qdatos ¹ PUSCH indicates a data modulation order that is a reference modulation order, and Mre is the total number of symbols that can be transmitted over a physical channel when transmitting data through the UL-SCH. In the present invention, Mre^PUSCH corresponds to Msc^PUSCHNSímb^PUSCH~'ⁿ'^cial, where Msc^PUSCH is the planned bandwidth for transmission on the PUSCH in a current subframe for the transport block, and Nsimb is the number of SC-FDMA symbols in the current subframe of transmission on the PUSCH.

Therefore, the reference MCS, MCS_ref, can be calculated using the following Equation 5.

Mre^PUSCH

MCS_reF ⁼----------⁼--------- CRdata Qdata Ndata

[Equation 5] in which CRdatos indicates a reference code rate, Ndatos indicates a data payload size, Qdatos indicates a data modulation order that is a reference modulation order, and Mre^{PU ch} indicates the total number of symbols that can be transmitted over a physical channel when transmitting data over the UL-SCH.

In general, a CRC is appended to the data to check for errors. In Equation 4 and Equation 5, the data payload size Ndata is defined as a value that includes the CRC, but may not include the CRC for the simple approximation.

Application of Example 1-A: in the case where the data and the CQI / PMI are transmitted together

When the data and the CQI / PMI are transmitted over the UL-SCH, the reference MCS is calculated using the payload size Ndata of the data. The number of the finally transmitted symbols of the CQI / PMI can be calculated using the following Equation 6.

CQI

<img file="ES2525555T3_D0012.tif" />

•10 ¹⁰ -MCS_ref

[Equation 6] in which Ncqi indicates a payload size of CQI / PMI, and Acqi indicates a parameter that expresses, in dB, an offset value to compensate for a difference between the data block error rate and the rate CQI / PMI block errors, and a difference between a data encoding scheme and a CQI / PMI encoding scheme, and Mcqi indicates the number of transmitted CQI / PMI symbols after rate matching.

If the number Mcqi of transmitted symbols of the CQI / PMI is obtained using Equation 6, the number Mdata of transmitted data symbols can be calculated using the following Equation 7.

Data ⁼ Mre^PUSCH - Mcqi

[Equation 7]

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PUSCH where Mre indicates the total number of symbols that can be transmitted over a physical channel when transmitting data on a UL-SCH. Since the data and the CQI / PMI are multiplexed after being rate-matched, the number of symbols obtained by subtracting Mcqi from Mre^PUSCH is the number Mdata of data symbols.

Application of Example 1-A: in the case where the data and the range indication are transmitted together

MCS_reJ

[Equation 8]

Where Nri indicates a range indication payload size, and Ari indicates a parameter that expresses, in dB, an offset value to compensate for a difference between the data block error rate and the block error rate range indication, and a difference between a data encoding scheme and a range indication encoding scheme, and Mri indicates the number of transmitted range indication symbols.

Once Mri is obtained using Equation 8, the number of transmitted symbol data can be calculated using Equation 9 below.

Data ⁼ Mre^PUSCH - Mri

[Equation 9] in which Mre indicates the total number of symbols that can be transmitted through a physical channel when transmitting data on a UL-SCH. Since the data and the range indication are multiplexed after being rate-matched, the number of symbols obtained by subtracting Mri from Mre^PUSCH is the number Mdata of symbols in the data.

Application of Example 1-A: In the case where the data, the CQI / PMI and the range indication are transmitted together

When the data, CQI / PMI and range indication are transmitted together, the Mcqi number of CQI / PMI transmitted symbols and the Mri number of range indication transmitted symbols are calculated using the reference MCS as follows.

CQI

<img file="ES2525555T3_D0013.tif" />

<img file="ES2525555T3_D0014.tif" />

MCS_ref

[Equation 10]

M_Kl = ^Δ«&lt;

Λ /_{λ /}· 10 · «MCS_{rf /}

[Equation 11]

PUSCH

If Mcqi and Mri are obtained, Mdata is calculated using Mre, ​​as follows.

Data ⁼ Mre^PUSCH - Mcqi - Mri

[Equation 12]

For exact decoding of the data, the CQI / PMI and the range indication between a UE and an eNB, the above calculations should be carried out exactly. However, since the above equations^TOc &lt;v ^δμ ¹⁰ 10 ¹⁰ include, etc., irrational numbers can be calculated. Therefore, a result of a calculation in¹⁰ in¹⁰UE and eNB may vary according to multiplication, division, and y calculation procedures ^{&gt; J} in the EU and the eNB.

ES 2 525 555 T3

A method is proposed to calculate the numbers of transmitted CQI / PMI and range indication symbols, such that a result of a division calculation does not generate a remainder.

The transmitted CQI / PMI symbol numbers and range indication are calculated using Equation 13 below.

<img file="ES2525555T3_D0015.tif" />

At • 10¹⁰ MCS_rtf

[Equation 13] in which N_x indicates an information payload size X, Δχ indicates a parameter that expresses, in dB, an offset value to compensate for a difference between the data block error rate and the information block error rate X, and a difference between a data decoding scheme and an X information decoding scheme, and Μχ indicates the number of transmitted X information symbols.

Ai.

¹⁰

In Equation 13, and the MCS_ref defined in Equation 5 can be calculated differently in the UE and the

Al in ίο eNB. The UE and the eNB can promise to define in advance^ιυ as a quantized value.

Table 1 listed below shows a result

By in ίο eNB they can define ^ιυ as a quantized value, according to í Al A

10¹⁰ To the ¹⁰ ') indicates a quantization value of. A fractional part to be expressed with N bits. In Table 1, a fractional quantized result of the same can be expressed with 6 bits is shown.

10¹⁰

At the in ίο of the quantization of ^ιυ . For example, the UE and the is shown in Table

1. In Table 1, ^^x(= how (λ ¹⁰ how much '' can so that a part

[Table 1]

<td>index</td><td>Δχ</td><td> ( ^Δϊ Ί i 10 ¹⁰βΧ = how ''</td>

<td> 0 (000)</td><td>0 dB</td><td> 1,0000000000</td>

<td> 1 (001)</td><td>1 dB</td><td> 1,2500000000</td>

<td> 2 (010)</td><td>2 dB</td><td> 1,5781250000</td>

<td> 3(011)</td><td>3 dB</td><td> 1,9843750000</td>

<td></td><td></td><td> 2,5000000000</td>

<td> 7 (111)</td><td>7 dB</td><td> 3,1562500000</td>

Tables 2 and 3 listed below show a result of the calculation of βχ when the X information is CQI / PMI or a range indication.

[Table 2]

<td>index</td><td>βκ /</td>

<td> 0</td><td> 1,250</td>

ES 2 525 555 T3

<td>Index</td><td>Pr /</td>

<td> 1</td><td> 1,625</td>

<td> 2</td><td> 2,000</td>

<td> 3</td><td> 2,500</td>

<td> 4</td><td> 3,125</td>

<td> 5</td><td> 4,000</td>

<td> 6</td><td> 5,000</td>

<td> 7</td><td> 6,250</td>

<td> 8</td><td> 8,000</td>

<td> 9</td><td> 10,000</td>

<td> 10</td><td> 12,625</td>

<td> 11</td><td> 15,875</td>

<td> 12</td><td> 20,000</td>

<td> 13</td><td>reserved</td>

<td> 14</td><td>reserved</td>

<td> 15</td><td>reserved</td>

[Table 3]

<td>Index</td><td>Pcqi</td>

<td> 0</td><td> 0,750</td>

<td> 1</td><td> 1,000</td>

<td> 2</td><td> 1,125</td>

<td> 3</td><td> 1,250</td>

<td> 4</td><td> 1,375</td>

<td> 5</td><td> 1,625</td>

<td> 6</td><td> 1,750</td>

<td> 7</td><td> 2,000</td>

<td> 8</td><td> 2,250</td>

<td> 9</td><td> 2,500</td>

<td> 10</td><td> 2,875</td>

<td> 11</td><td> 3,125</td>

<td> 12</td><td> 3,500</td>

<td> 13</td><td> 4,000</td>

<td> 14</td><td> 5,000</td>

<td> 15</td><td> 6,250</td>

ES 2 525 555 T3

Since MCS_ref can have multiple values, UE and eNB should store large amounts of values ​​in order to define MCR_ref as a quantized value between the UE and the eNB. However, in order not to store the quantized value, the division that could generate a non-integer calculation result should be eliminated.

Using Equation 13 and Equation 5, the number Μχ of transmitted information symbols X can be as follows.

<td></td><td>4.v</td><td></td><td>41 A / ™^scl</td>

<td>M_x =</td><td>N_x -10¹⁰ MCS „_F</td><td> —</td><td>jV_Y ·10¹⁰ · ^REA? Data</td>

[Equation 14]

In Equation 14, a denominator of MCS_ref can be transposed to Μχ. By transposing values ​​within a maximum bound function, the equality ("=") can be converted to an inequality ("&gt;"). That is, in the function of

Y

X maximum limit, Z = can be expressed as ZX&gt; Y, under the condition that Z is the smallest integer that satisfies ZX&gt; Y.

Thus, an equation for calculating the number of transmitted symbols of information X transmitted through a physical channel to solve a quantization problem can be defined as follows.

Μχ. Data&gt; Νχ. βχ. Mre^PUSCH

[Equation 15] where Mre indicates the total number of symbols that can be transmitted over a physical channel when transmitting data over a UL-SCH, Ndata indicates a data payload size, Νχ indicates the payload size useful information X, Μχ indicates the number of transmitted symbols of the information X and βχ indicates a value of the

10¹⁰ quantization of

PUSCH

When Ndata, Νχ, βχ, and Mre are given, Mx becomes the smallest integer that satisfies Equation 15.

Also, as / Les greater than 1, the inverse of βχ, that is, β'χ = 1 / βχ. can be used in Equation 15. The reason why β'χ is used is that when βχ is stored, an integer part and a fractional part should be stored, but when storing β'χ, only the fractional part can be stored. Accordingly, Equation 15 for calculating the number of transmitted symbols of the information X through a physical channel to solve the quantization problem can be defined as follows.

Μχ. β'χ. Data&gt; Νχ. Mre^PUSCH

[Equation 16]

When Ndata, Νχ, β'χ, and Mre are known, Mx is the smallest integer that satisfies Equation 16.

In Example 1-A, the reference MCS is calculated using a code rate and data modulation order under the assumption that only the data is transmitted over a UL-SCH, without transmitting CQI / PMI or range indication. . Therefore, the reference MCS may not be an exact value.

Namely: In Example 1-A, an exact code rate cannot be applied to the information (that is, data, CQI / PMI, and range indication). Assuming that the reference code rate is a data code rate, the data code rate can be determined only when a busy CQI / PMI and range indication rate are to be determined, among the total amount of information. The CQI / PMI busy rate and range indication, out of the total amount, can be known only when the code rate of the data is to be determined.

Example 1-B

In Example 1-B of the present invention, a procedure is proposed to simultaneously calculate data reference code rates, CQI / PMI and range indication in closed form, using the fact that the number

ES 2 525 555 T3 total transmitted symbols is the sum of the transmitted symbol numbers of the data, the CQI / PMI and the range indication by a UL-SCH. Specifically, assuming that a reference MCS is an unknown parameter and the numbers of transmitted CQI / PMI and range indication symbols are expressed as a function of the reference MCS, given that the total number of transmitted symbols of the data, CQI / PMI and range indication, exact reference MCS can be obtained.

Application of Example 1-B: in the case where data and CQI / PMI are transmitted together

When only data and CQI / PMI are transmitted, the total number of transmitted symbols can be indicated as the sum of the number of transmitted symbols of the CQI / PMI and the number of transmitted symbols of the data. Accordingly, a reference MCS is calculated using the equation for calculating the number of transmitted symbols from the CQI / PMI and the equation for calculating the number of transmitted symbols from the data. Then, the number of transmitted symbols from the data is calculated using the calculated reference MCS and the number of transmitted symbols from the CQI / PMI is calculated.

More specifically, the number of transmitted symbols of the data is calculated using the following Equation 17. In this case, the number of transmitted symbols of the CQI / PMI is expressed as a function of the number of transmitted symbols of the data and a equation of closed form, as shown in Equation 18 below.

MCS * data

<img file="ES2525555T3_D0016.tif" />

<img file="ES2525555T3_D0017.tif" />

PiJSCH RE

<img file="ES2525555T3_D0018.tif" />

<img file="ES2525555T3_D0019.tif" />

C'Qt

<img file="ES2525555T3_D0020.tif" />

IO

<img file="ES2525555T3_D0021.tif" />

data

<img file="ES2525555T3_D0022.tif" />

<img file="ES2525555T3_D0023.tif" />

data data

Ίν data

[Equation 17]

PUSCH

RE • 10 ¹⁰

<img file="ES2525555T3_D0024.tif" />

data + Λί data data

[Equation 18]

In Equation 17 and Equation 18, Ndata indicates a data payload size, Mdata indicates the number of ^J PUSCH transmitted symbols of the data, Mre indicates the total number of symbols that can be transmitted over a physical channel, MCS_ref indicates a reference MCS, Ncqi indicates a CQI / PMI payload size, Acqi indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a rate of CQI / PMI block errors, and a difference between a data encoding scheme and a CQI / PMI encoding scheme, and Mcqi indicates the number of transmitted CQI / PMI symbols.

Meanwhile, to solve a quantization problem, Equation 18 can be replaced by the following Equation 19.

(Mre Mdatos) Data Z. NqQ! PcQI Mdata

[Equation 19] ^TOrc »

WIO

PUSCH in which p_CQi sets a quantized value. When Ndata ^ Ncqi, Pcqi, and Mre are known, Mdata is the smallest integer that satisfies Equation 19.

If Mdata is obtained using Equation 19, Mcqi can be calculated using the following Equation 20.

Mcqi = Mre^PUSCH - Data

[Equation 20]

Application of Example 1-B: in the case where the data and the Range Indication are transmitted together

ES 2 525 555 T3

When only data and range indication are transmitted over a UL-SCH, the number of transmitted symbols of the range indication is calculated similarly to the case where only data and CQI / PMI are transmitted. A reference MCS is calculated using the equation for calculating the number of transmitted symbols from the range indication and the equation for calculating the number of transmitted symbols from the data. The number of transmitted symbols of the data is calculated using the calculated reference MCS and the number of transmitted symbols of the range indication is calculated.

More specifically, the number of transmitted symbols of the data is calculated using the following Equation 21. In this case, the number of transmitted symbols of the range indication is expressed as a function of the number of transmitted symbols of the data and a equation of closed form, as shown in the following Equation 22.

Μ^ηχι,= Μ + M

RE - R! '^1Vi data

<img file="ES2525555T3_D0025.tif" />

data

[Equation 21] data * 'data

[Equation 22]

In Equation 21 and Equation 22, Ndata indicates a data payload size, Mdata indicates the number of ^J PUSCH transmitted symbols of the data, Mre indicates the total number of symbols that can be transmitted over a physical channel, MCS_ref indicates a reference MCS, Nri indicates a range indication payload size, Ari indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a rate of range indication block errors, and a difference between a data encoding scheme and a range indication encoding scheme, and Mr, indicates the number of transmitted range indication symbols.

Meanwhile, to solve a quantization problem, Equation 22 can be replaced by the following Equation 23.

(Mre ~ Mdatos) Ndatos&gt; Nri. pRl. Data

[Equation 23]

1Λ Ιθ pusch in which Pri indicates a value obtained by quantizing. When Ndatos, Nri ,. Pri and Mre are known, Mdatos is the smallest integer that satisfies Equation 23.

If Mdata is obtained using Equation 23, Mr¡ can be calculated using the following Equation 24.

Mri = Mre^PUSCH - Data

[Equation 24]

Application of Example 1-B: in the case where the data, the CQI / PMI and the range indication are transmitted together

When data, CQI / PMI and range indication are transmitted, the total number of symbols transmitted by a UL-SCH can be indicated as the sum of the number of transmitted symbols of the CQI / PMI, the number of transmitted symbols of the indication range and the number of transmitted symbols of the data. Therefore,

ES 2 525 555 T3 a reference MCS can be calculated using the equation for calculating the number of transmitted symbols of CQI / PMI, the equation for calculating the number of transmitted symbols of range indication and the equation for calculating the number of transmitted symbols of data. The number of transmitted data symbols can be calculated using the calculated reference MCS and the numbers of transmitted CQI / PMI and range indication symbols can be calculated.

More specifically, the number of transmitted symbols of the data is calculated using the following Equation 25. In this case, the numbers of transmitted symbols of CQI / PMI and range indication are expressed as a function of the number of transmitted symbols of the data and an equation of closed form is obtained as shown in the following Equation 26.

= M_EC, +

N_cqi-10 ¹⁰ MCS_ref • 10 '° -MCS_nf

<img file="ES2525555T3_D0026.tif" />

¹⁰ · - jV data * ^v data '^^ data data

N ..

data

[Equation 25] i _Λ PUSCH RE

ι.Ί ^{to go}* data ^ 4 (jatos

N data

N data ^{+ M} data

[Equation 26] data payload size, Mdata indicates the number of a one

In Equation 25 and Equation 26, Ndata indicates a ^J PUSCH data transmitted symbols, Mre indicates the total number of symbols that can be transmitted via physical channel, MCS_ref indicates a reference MCS, Ncqi indicates a CQI / PMI payload size, Acqi indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and an error rate CQI / PMI block number, and a difference between a data encoding scheme and a CQI / PMI encoding scheme, Mcqi indicates the number of transmitted CQI / PMI symbols, Nri indicates a range indication payload size , Ari indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a range indication block error rate, and a difference between a data encoding scheme and a rank indication coding scheme, and Mr, indicates the number of transmitted rank indication symbols.

Meanwhile, to solve a quantization problem, Equation 26 can be replaced by the following Equation 27.

(Mre^PUSCH - Data) Data&gt; Nri .pR! . Mdata + Ncqi PcQI Mdata

[Equation 27]

1Ω ¹⁰ 10 ¹⁰ where Pcqi indicates a value obtained by quantizing, and Pri indicates a value obtained by quantizing

PUSCH

When Ndata ^ Nri, Pri, Ncqi, Pcqi, and Mre are known, Mdata is the smallest integer that satisfies Equation 27.

If Mdata is obtained, Mr¡ or Mcqi- is calculated At this time, a procedure is proposed to calculate Mcqi using the following Equation 28 after calculating Mdata, such that a range indication code rate by a limit function maximum may be less than a referral code rate. This is because the range indication may be more important than the CQI / PMI.

M ™^SCH -M data

Ai », 10 ¹⁰

N ^{; v} CQI

ES 2 525 555 T3

[Equation 28]

Meanwhile, to solve a quantization problem, Equation 28 can be replaced by Equation 29.

(Mre^PUSCH - Data - McQl) NcQI&gt; Nri. Pri. Mcqi

[Equation 29]

When Mdatos, Nri, Pri, Ncqi, and Mre are known, Mcqi is the smallest integer that satisfies Equation 29.

If Mdatos and Mcqi are obtained, Mri can be calculated as follows.

Mri = Mre^PUSCH - Data - Mcqi

[Equation 30]

Meanwhile, if Mri is calculated before Mcqi is calculated, the following Equation 31 can be used.

^¿CÍ&gt; r

M -10 ¹⁰

CQI ^1J

[Equation 31]

To solve a quantization problem, Equation 31 can be replaced by Equation 32.

(Mre^PUSCH - Data - Mri). Nri&gt; Ncqi. Pri. Mri

[Equation 32]

When Mdatos, Nri, Pri, Ncqi, and Mre are known, Mri is the smallest integer that satisfies Equation 32.

If Mdatos and Mri are obtained, Mcqi can be calculated as follows.

Mcqi = Mre^PUSCH - Data - Mri

[Equation 33]

The reason why it is calculated

Mcqi or Mri after calculating Mdatos by the above procedures is that the

M_{da! m} * * data values ​​of

CQ!

Ncqi

Mju_

N ^Rl , used as a reference MCS, are determined to be nearly equal.

In the case where a

CRC with different length than the data and the CQI / PMI, or a plurality of

M_{da! m} * * data

CRC to the data and to the CQI / PMI, the values ​​of cq¡

Ncqi

Mju_

N ^Rl may not essentially indicate the

I, and

same reference MCS. Therefore, to calculate all the values ​​from an equal reference MCS · Equation 28 can be expressed by the following Equation 34.

<td>-μ _λ„, = M_coi +</td><td>- M TV] Q ω TO' data</td>

[Equation 34]

To solve a quantization problem, Equation 34 can be replaced by Equation 35.

(Mre^PUSCH - Data - Mcqi) Data&gt; Nri. Pri. Data

ES 2 525 555 T3

[Equation 35]

PUSCH

When Mdatos, Ndatos, Nri, Pri, and Mre are known, Mcqi is the smallest integer that satisfies Equation 35.

If Mdatos and Mcqi are obtained, Mri can be calculated as follows.

Mri - Mre^PUSCH - Data - Mcqi

[Equation 36]

Similarly, Equation 31 can be expressed by the following Equation 37. Data, Mcqi, and Mri are calculated using Equation 37.

<img file="ES2525555T3_D0027.tif" />

<img file="ES2525555T3_D0028.tif" />

data

[Equation 37]

To solve a quantization problem, Equation 37 can be replaced by the following Equation 38.

(Mre^PUSCH - Data - Mri). Data&gt; NcQI Pri Data

[Equation 38]

PUSCH

When Mdatos, Ndatos, Pri, Ncqi, and Mre are known, Mri is the smallest integer that satisfies Equation 38.

If Mdatos and Mri are obtained, Mcqi can be calculated as follows.

Mcqi - Mre^PUSCH - Data - Mri

[Equation 39]

In Example 1-B, a procedure to calculate Mdata, Mri, and Mcqi is as follows.

(1) Stage 1 (stage to obtain Data) '·

The Mdata satisfying (Mre - Mdata) Ndatos&gt; Nri is calculated. Pri. Data + Ncqi. PcQI MdatosPUSCH

In this case, when Ndata ^ Nri, Pri, Ncqi, Pcqi and Mre are known, Mdata is the smallest integer that satisfies the previous equation.

(2) Stage 2 (stage to obtain Mcqi) '·

The Mcqi that satisfies (Mr_AND^pusch - M_givescough - Mcqi). Ndatos&gt; Nri. p_RÍ. MdatosPUSCH

In this case, when Mdata ^ Ndata, Nri, Pri and Nre are known, Mcqi is the smallest integer that satisfies the previous equation.

(3) Stage 3 (stage to obtain Mri):

Mri is calculated using Mri = Mre^PUSCH - Mdata - Mcqi Example 1-C

In Example 1-A, the reference MCS does not effectively consider an exact code rate and modulation order of the information when transmitting the data, the CQI / PMI, and the range indication. In Example 1-B, the procedure for calculating each information field is complicated. In Example 1-C, a procedure is proposed to express the reference MCS as a function of a certain variety of information, using the fact that an information MCS more closely approximates the reference MCS when using Example 1- B. That is, an approximate equation is used, as follows.

<img file="ES2525555T3_D0029.tif" />

ES 2 525 555 T3

[Equation 40]

Wherein the reference symbol indicates that a left value and a right value are approximately equal.

In defining the reference MCS as the ratio between the number of transmitted information symbols and an information payload size, a problem arises of not being aware of the number of transmitted information symbols. However, since the total number of transmitted symbols is known, the reference MCS can be obtained using the following Equation 41 without calculating the number of transmitted symbols of information.

Β] _ B-, _ B. _ B¡ + B₂ +

AAA a + A + A

[Equation 41]

Using Equation 41, the following Equation 42 can be derived.

<img file="ES2525555T3_D0030.tif" />

<img file="ES2525555T3_D0031.tif" />

<img file="ES2525555T3_D0032.tif" />

[Equation 42]

Even though a large variety of information is multiplexed and then transmitted, a UE recognizes the total number of transmitted symbols and a corresponding information payload size. Furthermore, even when the number of transmitted symbols of corresponding information is unknown, an approximate reference MCS can be calculated using the fact that the sum of the numbers of transmitted symbols of corresponding information is equal to the total number of symbols transmitted by a UL- SCH.

In this case, since the number of transmitted symbols of corresponding information is determined by an offset value to compensate for a difference in a coding gain or an operation block error rate with respect to the data, the reference MCS can be defined as follows.

(1) When the data and the CQI / PMI are transmitted by a UL-SCH, the reference MCS can be defined by the following Equation 43.

Mdata + McqI

<img file="ES2525555T3_D0033.tif" />

MCSref Ndatos + pCQI · NcQI

Ndata + pCQI NcQI

[Equation 43] (2) When data and range indication are transmitted by UL-SCH, the reference MCS can be defined as follows.

Data ⁺ Mri

<img file="ES2525555T3_D0034.tif" />

MCSref ~

Data + PrI Nri

Ndatos + Pri Nri

[Equation 44] (3) When data, CQI / PMI and range indication are transmitted by UL-SCH, the reference MCS can be defined as follows.

Mdatos + Meen + Mri

MCSref Ndatos + Peen Nccn + Pri Nri

Ndatos + Peen Nccn + Pri Nri

[Equation 45]

<img file="ES2525555T3_D0035.tif" />

ES 2 525 555 T3

That is, the reference MCS is defined as a value obtained by dividing the total number of symbols transmitted by a UL-SCH by the sum of the payload sizes of the transmitted information. At this time, the offset values ​​to compensate for a difference with the data reference MCS, such as a difference in an encoding scheme, an operation block error rate, etc., are multiplied by the payload size useful of the corresponding information.

Therefore, the numbers of the effectively transmitted CQI / PMI and range indication symbols can be calculated using the following Equation 46.

M_x = N_x 10¹⁰ MCS ref

[Equation 46]

Where Νχ indicates an information payload size X, Δχ indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data decoding scheme and an information decoding scheme (X), and Μχ indicates the number of transmitted symbols of X information. In this case, the X information may be CQI / PMI or range indication.

The number of transmitted symbols of data is a value obtained by subtracting the numbers of transmitted CQI / PMI and range indication symbols from the total number of symbols that can be transmitted.

The following examples indicate procedures for calculating the number of transmitted data symbols.

(1) When data and CQI / PMI are transmitted over a UL-SCH, the number of transmitted data symbols is calculated as follows.

Mdatos - Mre^PUSCH - Mcqi

[Equation 47] (2) When data and range indication are transmitted by UL-SCH, the number of transmitted data symbols is calculated as follows.

Mdatos - Mre^PUSCH - Mri

[Equation 48] (1) When data, CQI / PMI and range indication are transmitted by UL-SCH, the number of transmitted data symbols is calculated as follows.

Mdatos - Mre^PUSCH - Mcqi - Mri

[Equation 49]

Although the case where data is transmitted over a UL-SCH has been described, the CQI / PMI and range indication can be transmitted over the UL-SCH without transmitting the data.

Hereinafter, a method for calculating a control information code rate when no data is transmitted on a UL-SCH will be described.

In such a case, an eNB informs a UE only of the total number of symbols transmitted by the UL-SCH. Therefore, a reference MCS is not present. A procedure is proposed to calculate the reference MCS when the CQI / PMI and the range indication are transmitted by the UL-SCH.

Example 2-A

In Example 2-A, a procedure is proposed to calculate a reference MCS using the code rate and modulation order of the CQI / PMI under the assumption that only the CQI / PMI is transmitted by a UL-SCH when transmit the CQI / PMI and the range indication.

The CQI / PMI code rate can be defined as follows.

<img file="ES2525555T3_D0036.tif" />

<img file="ES2525555T3_D0037.tif" />

ES 2 525 555 T3

[Equation 50]

Where CRcqi indicates a reference code rate, Ncqi indicates a CQI / PMI payload size, Qcqi indicates a CQI / PMI modulation order that is a reference modulation order, and Mre^PUSCH indicates the number of symbols that can be transmitted over a physical channel when transmitting the CQI / PMI over a UL-SCH.

Therefore, the reference MCS can be calculated as follows.

MCS_ref =

CRcqi 'Qcqi

PUSCH RE

N

CQI

[Equation 51]

Application of Example 2-A: In the case where the CQI / PMI and the range indication are transmitted together

When the CQI / PMI and the range indication are transmitted together, the number of transmitted symbols of the range indication is calculated first, using a reference MCS, as shown in Equation 52 below. Then, the number of CQI / PMI transmitted symbols by subtracting the number of transmitted range indication symbols from the total number of symbols that can be transmitted over a physical channel.

m_ri =

[Equation 52]

M = M^rusCH^lrl CQI ^lri RE

[Equation 53]

In Equation 52 and Equation 53, Nri indicates a range indication payload size, Ari indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a range indication block error rate, and a difference between a data encoding scheme and a range indication encoding scheme, Mri indicates the number of symbols ^J * PUSCH transmitted of range indication, Mre indicates the total number of symbols that can be transmitted through a physical channel and Mcqi indicates the number of transmitted symbols of CQI / PMI.

However, the procedure described in Example 2-A can be implemented differently in a UE and in an eNB, as described in Examples 1-A and 1-B.

Therefore, to solve such a problem, Equation 52 can be replaced by the following Equation 54.

M ri Ncqi

<img file="ES2525555T3_D0038.tif" />

PUSCH RE

[Equation 54]

When Ncqi, Nri, Pri, and Mre are known, Mri is the smallest integer that satisfies Equation 54.

If Mri is obtained, Mcqi is calculated using Equation 53.

When calculating a CQI / PMI code rate using the procedure described in Example 2-A, an exact code rate is not applied to the information (ie, the CQI / PMI and the range indication). Assuming that a reference code rate is a CQI / PMI code rate, the CQI / PMI code rate can be determined only when a range indication busy rate is to be determined among the total amount of information. That is, the procedure described in Example 2-A assumes that the CQI / PMI code rate in an ideal state is the reference code rate under the assumption that only the CQI / PMI is transmitted.

Example 2-B

In Example 2-B, a procedure is proposed to simultaneously calculate the reference code rates of the CQI / PMI and the range indication in closed form, using the fact that the total number of symbols

ES 2 525 555 T3 transmitted is the sum of the numbers of symbols transmitted from the CQI / PMI and the range indication by a UL-SCH.

Specifically, assuming that a reference MCS is an unknown parameter and that the numbers of transmitted CQI / PMI and range indication symbols are expressed as a function of the reference MCS, since the total number of transmitted CQI symbols is known / PMI and range indication, an exact reference MCS can be obtained.

When the CQI / PMI and the range indication are transmitted by the UL-SCH, the total number of symbols transmitted by the UL-SCH can be indicated by the sum of the number of transmitted symbols from the CQI / PMI and the number of transmitted symbols from the UL-SCH. the range indication. Accordingly, a reference MCS is calculated using the equation for calculating the number of transmitted symbols of the range indication and the equation for calculating the number of finally transmitted symbols of the CQI / PMI. The number of transmitted symbols of the range indication is calculated using the calculated reference MCS and then the number of transmitted symbols of the CQI / PMI is calculated.

That is, the number of transmitted symbols of the range indication is calculated using the following Equation 55. In this case, the number of transmitted symbols of the CQI / PMI is expressed as a function of the number of transmitted symbols of the range indication and An equation of closed form is obtained as shown in the following Equation 56.

m^pr^orand^sc"= M_cqi+ m_ri

[Equation 55]

M^PR^ORAND^SC"= M_cq, + tV_w-10¹⁰ -MCS_ref

M + N_r, 10¹⁰ ·

CQI

N CQI

[Equation 56]

In Equation 54 and Equation 55, Nr \ indicates a range indication payload size, Ar, indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a range indication block error rate, and a difference between a data encoding scheme and a range indication encoding scheme, Mr, indicates the number of symbols ^J * PUSCH transmitted of range indication, Mre indicates the total number of symbols that can be transmitted through a physical channel and Mcqi indicates the number of transmitted symbols of CQI / PMI.

To solve a quantization problem, Equation 56 can be replaced by the following Equation 57.

(m^pusch-M Ϊ / V&gt; N β -M \ 'RE CQ! ) CQ! ~ R! Pr1^iV1 CQI

[Equation 57] ¹⁰ PUSCH where βρι indicates a value obtained by quantizing. When Nr, Ncqi, Pri, and Mre are known, Mcqi is the smallest integer that satisfies Equation 57.

Example 2-C

Example 2-C uses the same principle as Example 1-C. Since there is no transmitted data, the range indication is calculated first when calculating the CQI / PMI. Therefore, when the range indication and CQI / PMI are transmitted by a UL-SCH, a reference MCS is defined as follows.

MCS ref ____CQ! + M_R____

Pcqi 'Ncqi + 0r¡' N_ri

PUSCH

RE

Pcqi 'N_Cqi + β_κι N_Rl

[Equation 58]

ES 2 525 555 T3

The number of transmitted symbols from the range indication is calculated using the following Equation 59. The number of transmitted symbols from the CQI / PMI is calculated by subtracting the number of transmitted symbols from the range indication from the total number of symbols transmitted by the UL- SCH.

<img file="ES2525555T3_D0039.tif" />

[Equation 59]

Where Νχ indicates an information payload size X, Δχ indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data decoding scheme and an information decoding scheme (X), and Μχ indicates the number of transmitted symbols of X information. In Equation 59, the X information may correspond to the range indication.

Example 3

The ACK / NACK information is inserted by data punch, CQI / PMI and multiplexed range indications, and thus a code rate of the information can be changed. However, as an eNB does not always know whether or not a UE transmits ACK / NACK information, the number of transmitted symbols of ACK / NACK information is calculated independently, using a reference MCS after the number of occupied symbols in a UL -SCH.

M_RE^PUSCH Data

When data is present, MCS is used_ref = ---------- or MCS_ref = ---- Ndata Ndata as a reference MCS. When data is not present and only CQI / PMI and indications of. &lt;PUSCH ix

MCS_F= - ^ - MCS_F=—^~

N ^F N range by a UL-SCH, they are used ^CQI or ^CQ'as the reference MCS. That is, a

MCS_ref

Reference MCS used by ACK / NACK information can be generalized as transmitted symbols of ACK / NACK information can be represented as follows and number way.

<td></td><td></td><td></td><td> —</td>

<td></td><td>N_{a / n}-10 MCS_ref</td><td> —</td><td>N .in ¹⁰ X^tyAIN ^1υ^ X</td>

[Equation 60]

Where Na / n indicates an information payload size of ACK / NACK and Δαμ indicates a parameter that expresses, in dB, an offset value to compensate for a difference between a data block error rate and a rate of ACK / NACK information block errors, and a difference between a data encoding scheme and an ACK / NACK information encoding scheme, and Ma / n indicates the number of finally transmitted ACK / NACK information symbols.

To solve a quantization problem, a procedure for calculating the number of transmitted symbols of ACK / NACK information over a physical channel is as follows.

'^Nx β_ΑΙΝΜ_χ

[Equation 61]

ES 2 525 555 T3

1Ω ¹⁰

In which Pa / n indicates a value obtained by quantizing. When Μχ, Νχ, Pa / n and Na / n are known, Mam is the smallest integer that satisfies Equation 61.

Example 4

Unlike data or CQI / PMIs, ACK / NACK information and range indication transmitted by a UL-SCH always use Quadrature Phase Shift Modulation (QPSK) or Binary Phase Shift Modulation (BPSK) . To implement such a specific modulation scheme, the ACK / NACK and range indication can use only 4 of the outermost coordinates (2 of the outermost coordinates when using BPSK) of a constellation of modulations of the data or CQI / PMI. .

FIG. 12 illustrates an example of modulation constellation coordinates used for ACK / NACK information and range indication when data and CQI / PMI use a quadrature amplitude modulation (QAM) scheme 16. FIG. 13 illustrates an example of modulation constellation coordinates used for ACK / NACK information and range indication when data and CQI / PMI use a 64 QAM scheme.

As illustrated in FIGS. 12 and 13, if the ACK / NACK information and the range indication use the 4 outermost coordinates, since the symbol locations of the ACK / NACK information and the range indication can be at the maximum distance from each other In terms of Euclidean distance, performance can be improved.

However, if only the outermost coordinates are used in the modulation constellation coordinates, an average transmit power of ACK / NACK information and range indication is greater than 1 under the assumption that an average transmit power of data and CQI / PMI is 1. Therefore, when calculating the number of transmitted symbols of ACK / NACK and range indication information by a UL-SCH, whether a modulation order of the data or CQI / PMI is 16 QAM or 64 QAM, it is proposed a procedure to calculate the number of transmitted symbols of the ACK / NACK and range indication information by the UL-SCH, β = 10 ¹⁰

Rqam using an additional offset offset parameter, in addition to a parameter of β ,,. = 10¹⁰ Λ, = 10 '° offset offset or

When the order of modulation of the data or the CQI / PMI is QPSK, Ma / n and Mri are calculated using embodiments 1-A, 1-B, 2-A and 2-B described above. When the modulation order of the data or the CQI /

<td>PMI</td><td>is 16 QAM, the number of</td><td>symbols of the corresponding information are</td><td>calculate using</td>

<td></td><td>Áw + ^_{16Y? A1M}</td><td></td><td rowspan="2">Λ / = ιθ¹⁰</td>

<td>TO,</td><td>= A, A_t™ = io "</td><td>Α, «= Α, .ν · Α« „= ιο”</td>

<td></td><td>OR</td><td>instead of</td><td>OR</td>

<td>β'ai n</td><td> = 10 ¹⁰</td><td></td><td></td>

<td></td><td>in Examples 1-A, 1-B,</td><td>2-A and 2-B.</td><td></td>

I know

When the modulation order of the data or the CQI / PMI is 64 QAM, the number of information symbols

A, „= A,« - ZU ,, = io- ~ o

&amp; RI

Pr¡ ⁼ βκΐ 'P \ bQAM ^{= 10} calculate using

Λ, = 10¹⁰ β_{Λ / Ν}=10'°

Or in Examples 1-A, 1-B, 2-A and 2-B.

instead of

To compensate for a difference in power in the ACK / NACK information and the range indication when using 16 QAM or 64 QAM as the modulation order of the data or the CQI / PMI, the offset values ​​&amp; Λ1Λ 'EüL β = 10 ¹⁰ β = 10 ¹⁰^Av Y ^w ACK / NACK information and range indication may be set differently depending on the modulation order. Therefore, a corresponding offset value is used according to the modulation order of the data or the CQI / PMI.

Example 5

ES 2 525 555 T3

The maximum numbers of transmittable ACK / NACK information and range indication symbols may be limited. As a method proposed in the present invention, when calculating Ma / n, which is the number of transmitted symbols of the ACK / NACK information, if Ma / n is greater than the maximum number of transmittable symbols of ACK / NACK information, Ma / n is set to the maximum number of transmittable symbols of the ACK / NACK information. Also, when calculating Mr, which is the number of transmitted symbols of the ACK / NACK information, if Mri is greater than the maximum number of transmittable symbols of range indication, Mri is set to the maximum number of transmittable symbols of the indication rank. The maximum numbers or values ​​of Ma / n and Mri can be 12 x Nrb x 4. Here, Nrb indicates the number of resource blocks (RB) transmitted over a physical shared uplink channel (PUSCH). If an RB is transmitted through the PUSCH, the maximum Ma / n and Mri values ​​are 48.

As in Embodiment 1-B, if the data, CQI / PMI, and range indication are multiplexed, the number of transmitted symbols of the range indication can be calculated last, depending on the circumstances. Then it is confirmed whether the Mri number of transmitted symbols of the range indication exceeds a maximum transmittable value. If Mri exceeds the maximum value, Mri is limited to the maximum value, and data symbols or CQI / PMI corresponding to a difference between the calculated Mri and the maximum transmittable value are further transmitted.

Example 6

In some cases, a referral code rate greater than 1 may be set or calculated. If the referral code rate is greater than 1, the CQI / PMI, range indication, and ACK / NACK information are not decoded in an eNB, and a UE can transmit unnecessary information. In this case, the number of transmitted symbols of the CQI / pMi, the range indication and the ACK / NACK information can be set to 0 and only the data can be transmitted.

To effectively use an uplink, an eNB may not generate a circumstance with a code rate greater than 1. If a UE detects such a circumstance, it is determined that the eNB has made an error or that the UE has read different control information, so no information can be transmitted to the uplink.

Embodiment 1

In a communication system, if an error occurs in a data packet due to a reception failure after the packet has been transmitted, the corresponding data packet is retransmitted. Retransmission can be ordered by the eNB or it can be done by a predetermined schedule.

FIG. 14 shows a HARQ process to explain data retransmission. As shown in FIG. 14, it is configured that the maximum number of processes must be 8 processes and that the maximum retransmission time is set at 4. In each process, when the UE receives the Grant_UL from the eNB in ​​the timing of the nth subframe, the UE begins transmitting data at the n + 4th subframe.

For example, in process 1, if the UE does not receive an ACK from the eNB during triple retransmission of data (eg, indicated by '1' in FIG. 14) stored in a buffer after starting to transmit data in an n + 4-th subframe, the UE flushes the buffer, reconstructs the data, and transmits the reconstructed data (e.g., indicated by 1_re in FIG. 14). Process 2 is an identical case to Process 1. In Process 3, if the UE receives an ACK from the eNB after retransmitting data (eg, shifted by 3 in FIG. 14) 2 times, the UE transmits new data (eg, indicated with 3 'in FlG. 14) in 4^to transmission timing. Also, in process 3, if the UE does not receive an ACK from the eNB after transmitting the new data, the UE retransmits the new data at the 5th transmission timing. Processes 4 to 6 can be explained as described above. Furthermore, each of the processes 1 to 8 is operated independently.

In the case where retransmission occurs, if decoding is performed using an initially received data packet and a data packet received by retransmission, the probability of success in receiving the data packets increases, even if not all resources are used. used when the data packet is initially transmitted.

For example, when the communication system operates such that the initial data packet is transmitted error-free with a probability of 90%, the system does not encounter any problems even when the data packet is retransmitted at a code rate greater than a code rate of the initial data packet. Transmitting a data packet at a high code rate means that fewer physical transmission resources are used than during the initial transmission of the data packet.

In the present invention, a method of calculating a reference MCS using a data packet size and the total number of symbols that can be transmitted through a PUSCH, and a method of calculating the number of transmitted CQI symbols have been proposed. / PMI and range indication, using reference MCS.

ES 2 525 555 T3

However, even if a smaller number of data symbols are transmitted than during the initial transmission, no problem occurs in the operation of the system, and the efficiency can be improved. Consequently, a lower number of total symbols may be allocated in a PUSCH during data retransmission. At this time, the CQI / PMI and / or the range indication can be multiplexed with retransmitted data and can then be retransmitted.

If the reference MCS is calculated using the total number of symbols that can be transmitted in a corresponding PUSCH transmission time, a code rate that can stably transmit the CQI / PMI and / or the range indication may not be set. FIG. 15 is a diagram explaining a usage relationship of a reference MCS during data retransmission. As illustrated in FIG. 15, while the data is retransmitted through a PUSCH, a procedure is proposed to calculate the numbers of transmitted symbols of CQI / PMI, range indication and ACK / NACK information, using a code rate used during the initial transmission of the data.

More specifically, a reference MCS in Equation 62 below, to calculate the number of transmitted symbols of information X, employs a reference MCS used when the data is initially transmitted.

M_x

To the

N_x -10 ¹⁰ -MCS_rcf

[Equation 62]

In which MCS_ref indicates a reference MCS when data is initially transmitted, Νχ indicates an information payload size X, Δχ indicates a parameter that expresses, in dB, an offset value to compensate for a difference between the data decoding scheme and the decoding scheme of the X information, and Μχ indicates the number of transmitted symbols of X information. The X information may be CQI / PMI, range indication or ACK / NACK information.

Equation 62 can be expressed by the following equation 63.

Q '=

OM rUSC / i-initial, vc

N

PUSCH-initial symbol /&gt; PUSCH offset

Cl

Σ^κ&gt;

r = 0

[Equation 63]

In Equation 63, Q 'is the number of transmitted symbols of the control information (e.g., CQI / PMI, range indication, or ACK / NACK information) when the data is retransmitted, and O is the size of payload of control information when data is retransmitted. N_Sim^PUSCH~'ⁿ'^cial is a number of SC-FDMA symbols per subframe for the Physical Uplink Shared Channel (PUSCH) transmission when the data is initially transmitted, and Msc^{P! JSCH}~^{! n! C! al} it is a scheduled transmission of the broadband PUSCH when the data is initially transmitted. Thus, Msc^{P! JSCH}~^{! n! C! al}. N_Sim^{PlJS H}~'^initial is the total number of transmittable symbols of the Physical Uplink Shared Channel (PUSCH) when the data is initially transmitted.

nPUSCH «offset and F is the offset value. ^{r = t)} is the payload size of the data when the data is initially transmitted, r is the codelock number of the data before encoding per channel, K_r is a number of bits in code block number r, and C is a total number of code blocks.

In an LTE system, when a data packet is retransmitted, redundancy version numbers (RV) are assigned according to a form of retransmission. However, in transmission through a PUSCH, RV numbers 1, 2, and 3, between RV numbers 0, 1, 2, and 3, are used only for retransmission. Therefore, if the data is transmitted during the transmission of the PUSCH with the number of RV 1, 2 or 3, the transmitted symbol numbers of CQI / PMI, range indication and ACK / NACK information are calculated using an MCS of reference when data is transmitted with RV number 0. That is, if the data is retransmitted, the transmitted CQI / PMI symbol numbers, range indication, and ACK / NACK information are calculated using equation 63.

ES 2 525 555 T3

In Embodiment 1, a function of each module of a UE during retransmission is as follows.

FIG. 16 is a block diagram of a UE according to an example of the present invention. A UE 130 includes a first channel coding module 131, a second channel coding module 132, and a transport module 133. The UE 130 may additionally include modules such as a multiplexing module, a transport module, and an interleaving module, but these are omitted for convenience of description.

The first channel coding module 131 performs channel coding on the data to be retransmitted. The second channel coding module 132 performs channel coding on the control information.

The second channel coding module 132 calculates the number of transmitted symbols of the control channel, using Equation 63.

The transport module 133 performs channel interleaving on the first channel-encoded data and the second channel-encoded control information, and transmits the uplink interleaved signal to an uplink.

According to the configuration described above, a code rate can be set to stably transmit the CQI / PMI and / or the range indication during data retransmission.

As is evident from the above description, when data and control information is transmitted via an uplink channel, an uplink signal including the data and control information can be transmitted, accurately calculating the code rates. of data and control information.

The present invention can be applied to a UE, an eNB or other equipment of a mobile radio communication system. If applied to an eNB, the eNB performs a deinterleaving and decoding operation to obtain the signal from the encoded / interleaved signal sent by the UE.

FIG. 17 is a block diagram showing constituent elements of a device 50, which can be either a UE or an eNB, and which can carry out the procedures described above. Device 50 includes a processor 51, a memory 52, a radio frequency (RF) unit 53, a display unit 54, and a user interface unit 55. The radio interface protocol layers are implemented in processor 51. Processor 51 provides the control plane and the user plane. The function of each layer may be implemented in processor 51. Processor 51 may also include a contention resolution timer. Memory 52 is coupled with processor 51 and stores an operating system, applications, and general files. If the device 50 is a UE, the display unit 54 displays a wide variety of information and may use a well-known item, such as a liquid crystal display (LCD), an organic light-emitting diode (OLED), etc. The user interface unit 55 can be configured with a combination of well-known user interfaces, such as a key panel, a touch screen, etc. RF unit 53 is coupled with processor 51 and transmits and / or receives radio signals.

The above-described embodiments are provided by combining constituent elements of the present invention in specific ways. The constituent elements or features of the present invention may be considered optional if not explicitly stated otherwise. The constituent elements or features can be implemented without being combined with other constituent elements or features. Embodiments of the present invention can also be provided by combining some of the constituent elements and / or features. The order of operations in embodiments of the present invention can be changed. Some constituent elements or features of one embodiment may be included in another embodiment or may be replaced by corresponding constituent elements or features of another embodiment. It is clear that the present invention can be realized by a combination of claims that are not explicitly cited in the appended claims, or it can include new claims by amendment after the application.

Embodiments of the present invention have been described focusing on the data communication relationship between an eNB and a UE. Here, the eNB refers to a terminal node of a network that communicates directly with the UE. In some cases, a specific operation, described as being performed by the eNB, may be performed by a node higher than the eNB.

That is, it is clear that the eNB or any other network nodes can perform various operations for communication with the UE in a network composed of a plurality of network nodes including the eNB. The term 'eNB' can be replaced by the term 'fixed station', 'Node B', 'access point', etc. The term 'UE' corresponds to a mobile station (MS) and the MS can be replaced by the term 'subscriber station' (SS), 'mobile subscriber station' (MSS), 'mobile terminal', etc.

The UE used in the present invention can be an electronic address book (PDA), a cell phone, a personal communication service (PCS) phone, a global system for mobile phone (GSM) phone, a phone

ES 2 525 555 T3 code division multiple access (broadband CDMA), a mobile broadband system (MBS) telephone, etc.

Embodiments of the present invention can be implemented by various means, eg, hardware, firmware, software, or a combination thereof.

In a hardware configuration, the methods according to embodiments of the present invention may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSP), digital signal processing devices (DSPD), Programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.

In a firmware or software configuration, the methods according to the embodiments of the present invention can be implemented in the form of modules, procedures, functions, etc., that carry out the functions or operations described above. The software code can be stored in a memory unit, in order to be controlled by a processor. The memory unit is located inside or outside the processor and can transmit data to and receive data from the processor by various known means.

The present invention may be carried out in other specific ways than those set forth herein without departing from the essential features of the appended claims. The foregoing description, therefore, is to be construed in all respects as illustrative and not restrictive. The scope of the invention should be determined by the reasonable interpretation of the appended claims.