Apparatus, system anmd method for managing reverse link communication

[0001] This application claims priority privilege from Provisional Patent Application No. 60 / 501,563 filed on September 8, 2003, entitled "Method And Apparatus for Traffic-to-Pilot Management for Code Division Multiple Access (CDMA) Reverse link" and a temporary patent application No. 60 / 501,450 filed on September 8, 2003, entitled "Method And Apparatus for Traffic-to Pilot Management for Code Division Multiple Access (CDMA) Reverse link".

BACKGROUND OF THE INVENTION [0002] The invention relates generally to communication systems, and more particularly to an apparatus, system and method for managing reverse link resources in a communication system.

[0003] Many wireless communication systems use geographically dispersed base stations to provide communication cells or areas in which a service base station provides communication service to mobile stations in an area corresponding to a service base station. In some situations, the reverse link signals transmitted from each mobile station to the base station interfere with the signals of other reverse links transmitted from other mobile stations. Due to interference and limited resources, the performance of each base station is limited and many systems manage reverse link resources to improve the overall operation of the communication system. One way to manage reverse link resources is to limit the transmitted energy of mobile stations. some

Conventional systems include a retransmission mechanism that allows information to be accurately reconstructed and received by base stations. By limiting the transmission power level to a relatively low power level, reverse link resources are efficiently utilized, while retransmissions allow accurate reproduction of the transmitted information. The effect of the retransmission plan is increased system performance for time-varying channels, because when a good channel is used, the retransmission plan ends early. Conventional systems, however, are limited in that the effect of retransmission is an increase in transmission delay on the reverse link channels. The resource management techniques of conventional systems allow mobile stations to transmit a reverse link signal with higher relative transmission power levels in which data block sizes are larger. However, for relatively smaller data blocks it is required that the mobile station transmits at substantially lower relative power levels, resulting in approximately the same average delay times for all data block sizes.

[0004] Document WO01 / 78291 describes a method in which transmission power is adjusted (reduced) when the overall message length is reduced (frames are correctly received).

[0005] Accordingly, a device, system and method are needed for efficiently managing reverse link resources in a communication system based on delay-dependent relationships.

SUMMARY OF THE INVENTION [0006] According to the present invention, there is provided a method of managing communication link resources from a mobile station to a base station in a communication system, such as

53 is a device for managing communication link resources from a mobile station to a base station in a communication system as set forth in claim 6, and a computer readable medium comprising a method of managing communication link resources from the mobile station to a base station in a communication system, as set forth in claim 16. Preferred embodiments of the invention are claimed in the dependent claims.

BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 is a block diagram of a communication system in accordance with an embodiment of the invention. [0008] FIG. 2 is a table containing exemplary reverse link transmission guidelines in which the reverse link transmission power levels and data block sizes are represented by alphanumeric variables.

[0009] FIG. 3 is a table containing exemplary reverse link transmission guidelines established using the gain value received from the base station.

[0010] FIG. 4 is a table containing reverse link transmission guidelines including exemplary values, in which the data block sizes are shown in bits and the transmission power levels are shown as traffic signal to pilot ratio (TPR traffic to pilot ratio).

[0011] FIG. 5 is a diagram of a method of managing reverse link resources implemented by a mobile station in accordance with an embodiment of the invention.

[0012] FIG. 6 is a diagram of a method of managing reverse link resources implemented by a base station in accordance with an embodiment of the invention.

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DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS [0013] According to an exemplary embodiment of the invention, the device, system and method efficiently manage uplink resources by allowing a mobile station to choose between transmitting a block of data with a standard power level and transmitting a smaller block of data with an increased power level. As a result, the mobile station can autonomously select the QoS (Service Quality) level for individual packages based on the delay requirements of individual packages. Based on the reverse link transmission information received from the base station, the mobile station establishes reverse link transmission guidelines defining power levels and associated data blocks for at least the standard service and the enhancement service. The mobile station selects the reverse link transmission power level from a plurality of power levels including at least the standard reverse link transmission power level associated with the standard data block size and the increased reverse link transmission power level associated with the increased data block size, wherein the standard data block size is larger than the size of the reinforced data block.

[0014] In an exemplary embodiment, the reverse link signals are transmitted in accordance with a hybrid automatic reply (HARQ) protocol. In order to efficiently utilize reverse link resources, reverse link transmission power levels are maintained at levels that result in multiple retransmissions to effectively transfer data blocks of most reverse link signals. The retransmission plan results in increased system performance for time-varying channels because the retransmission plan terminates early when a good channel is used. Data blocks sent using reverse link signals are transmitted at relatively high transmission power levels

They experience less retransmission and, as a consequence, experience on average less delay than data blocks transmitted with lower transmission power levels. Selecting a specific power level for data block transmission affects the number of retransmissions required to achieve the desired rate of error frames and thus provides a compromise control mechanism between packet delay and system performance. In a distributed system using reverse link transmissions (or uplinks), the centralized planning unit at the base station usually does not have information about the delay requirements of future reverse link packets, which packets are to be transmitted from the mobile station. Based on the available reverse link resources and the requirements for the regular reverse link transmission of mobile stations, the base station allocates authorized transmission power levels.

According to the authorized restrictions, the base station chooses between transmitting a smaller data block with a smaller delay and transmitting a larger data block with a larger delay. Accordingly, mobile stations autonomously select the allowed combination of data block size and uplink transmission power level based on the preferred packet QoS level or service QoS level between the mobile station and the base station. In implementation, the reverse link transmission power levels are characterized, determined and managed depending on the traffic signal to pilot ratio (TPR) power ratios, where the power control mechanism maintains the pilot signal power at the receiver at the desired level for sufficient channel evaluation. In this way, TPRs provide a scale factor for determining the actual transmission power in the traffic channel. Those skilled in the art know that under certain conditions various other techniques may be used to determine and characterize transmission power levels. In addition, in the running sample

In some conditions, more than two service levels may be provided.

[0015] In the exemplary embodiment, the QoS indicator transmitted from the mobile station to the base station via the associated control channel indicates the selected QoS level of the transmitted packet. Based on the QoS indicator, the base station determines the TPR used by the mobile station, which results in improved performance.

[0016] One or more of the exemplary embodiments described herein is explained in the context of digital wireless data communication systems. Because it is preferred to use this context, various embodiments of the invention may be introduced in various environments or configurations. Basically, the described systems can be created using software-controlled processors, integrated circuits or discrete logic. Data, instructions, commands, information, signals, symbols and microcircuits that can be referred to throughout the application are preferably represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles or a combination thereof. In addition, the blocks represented in each block diagram may represent hardware or may represent steps or functions of a method.

[0017] In particular, various embodiments of the invention may be incorporated into a wireless communication system operating in accordance with the code-sharing multiple access technique (CDMA), which has been presented and described in various standards published by the Telecommunications Industry Association (TIA) and other standards organizations. Such standards include the TIA / EIA-95 standard, the TIA / EIA-IS-2000 standard, the IMT-2000 standard, UMTS and WCDMA standards, all of which are incorporated herein by reference. The system for data communication is

53 / 59P28252EN00 also described in detail in the document "TIA / EIA / IS-856 cdma2000 High Rate Packet Data Air Interface Specification" incorporated herein by reference. A copy of the standards can be obtained by accessing the World Wide Web or by writing to the TIA Department of Standards and Technology, Wilson Boulevard 2500, Arlington, VA 22201, United States of America. A standard generally referred to as the UMTS standard, incorporated herein by reference, can be obtained by contacting 3GPP Support Office, 650 Route des Lucioles-Sophia, Antipolis, Valbonne-France.

[0018] In addition, one or more embodiments of the invention may also be used in Orthogonal Frequency Division Multiple Access (OFDMA) systems. The performance of OFDMA systems in the reverse link is limited by interference from mobile devices in neighboring cells, and the base station or centralized unit must ensure that mobile stations do not transmit at a higher power level than that required. The base station allocates frequency tones, also called subcarriers, and the standard data block format to be transmitted with a specific TPR on the reverse link. TPR in the context of OFDMA relates to the ratio of data tone power to pilot tone power. In the exemplary embodiment, the mobile station may transmit a standard data block format corresponding to the allocated TPR or choose to transmit the enhanced data block format at a lower coding efficiency and / or lower modulation valency, but with a specific TPR in the allocated subcarriers. The format of the enhanced data block corresponding to the format of the standard data block is predetermined by both the base station and the mobile station with one-to-one compatibility. The mobile station may transmit the QoS indicator if the control channel is associated with packet transmission on the reverse link. For a fully planned OFDMA system, such as 802.16,

53 / 59P28252EN00 published by the Institute of Electrical and Electronics Engineers (IEEE), the mobile station is not allocated a reverse traffic control channel. In such cases, the base station may make an incorrect detection by attempting to decode both the standard format and the reinforced block of data transmitted at a particular TPR. The presence of cyclic redundancy check (CRC) allows the base station receiver to determine if the decoded data block is valid.

[0019] FIG. 1 is a block diagram of a communication system 100 in accordance with an exemplary embodiment of the invention. The communication system 100 is capable of operating in accordance with any standard of a wireless communication system and can be used for voice, data or both communication in the exemplary embodiment. Exemplary communication system 100 includes base stations 102-104 that exchange data and control information over communication links 106-116 between a number of mobile stations 118-122 and a wired network 126 including a public telephone network and a data network. As discussed, Switched Mobile Stations 118-122 and contain any number of operations in the system below in the next details, base stations 102, 104 can make components that facilitate communication 100.

[0020] In some situations, base station 102 may communicate with other base stations 104. Base stations 102104 and various control nodes (not shown) control various aspects of the operation of the communication system 100, as well as in a point-to-point backhaul link 124 between wired network 126 and base stations 102, 104. The backhaul 124 point-to-point link includes equipment and infrastructure to facilitate the exchange of data and other information between wired network 126 and base stations 102, 104, and in the example

The embodiment includes at least a base controller (BSC).

[0021] Each base station 102, 104 communicates with mobile stations 118-122 that in the specified base station, the station being within range of the link are in the area of ​​signals 106-108 over the forward and signals 110-116 of the reverse link. Forward link signals directed to mobile stations 118-120 can be summed up and create forward link signal 106. In the exemplary situation shown in FIG. 1, one base station 102 communicates with mobile stations 118-122 using one forward link signal 106, and the other base station 104 uses another forward link signal 108 to communicate with mobile station 122. The forward link may carry a number of different downlink channels such as control channels. The control channel may be shared by mobile stations 118-122 to receive control information. Mobile stations 118-122 communicate with base stations 102-104 using the corresponding uplink signals 110, 112, 114 transmitted from mobile stations 118-122 to base stations 102-104. Uplink signal 114 directed to one base station 104 may be received and decoded at other base stations 102. Because mobile stations 118-122 can move from one position to another and because channel conditions can change, mobile stations 118-122 maintain an active set of base stations that can be used for communication according to known techniques.

[0022] Mobile station 118 may include any combination of computer hardware, software and system software that performs functions for mobile stations 118-122 as described herein and, in an exemplary embodiment, includes transceiver 136, controller 138, and memory 140. Block functions and operations the mobile station described in FIG. 1 may be implemented in any number of devices, systems or software. Two

53 / 59P28252EN00 or more functional blocks may be integrated in a single device, and functions described as performed in any single device or block may be implemented in several devices. For example, some receiving or transmitting processes may be performed by the controller 138.

[0023] Mobile station 118 includes a radio transceiver 136 configured to communicate with base station 102104 in accordance with the protocols of a particular communication system 100. Transceiver 136 includes a transmitter and a receiver in an exemplary embodiment. Radio frequency signals are exchanged through one or more antennas 142. Radio transceiver 138 modulates, amplifies and transmits uplink signals over the reverse link and receives and demodulates downlink signals 106 transmitted by base station 102 over the forward link.

[0024] The controller 138 is any processor, microprocessor, computer, microcomputer or processor combination suitable for performing the control and computational functions of the mobile station 118 described herein, as well as facilitating the overall functionality of the mobile station 118. The program code running on the controller 138 performs the steps of signal processing methods and performing reverse link management functions of exemplary embodiments.

[0025] Memory 140 is any memory suitable for storing values, parameters, program code and other information in accordance with known techniques. Memory 140 may be implemented, for example, in an integrated circuit (IC).

[0026] Base station 102 may include any combination of computer hardware, software and firmware that performs functions for base stations 102104. The functions and operations of the blocks described in FIG. 1 may be implemented in any number of devices, systems or software. Two or more functional blocks can be

53 / 59P28252EN00 integrated in a single device, and functions described as being performed in any single device or block may be implemented in several devices. For example, some receiving processes may be performed by controller 132.

[0027] The base station includes a radio transceiver 130 configured to communicate with mobile stations 118122 in accordance with the protocols of a particular communication system 100. The transceiver 130 includes a transmitter and a receiver. Radio frequency signals are exchanged via antenna 144, which may contain sectors under certain conditions. Radio transceiver 130 modulates, amplifies and transmits signals over the forward link and receives and demodulates reverse link signals transmitted by mobile stations 118-120 over the reverse link.

[0028] The controller 132 is any processor, microprocessor, computer, microcomputer or processor combination suitable for performing the control and computational functions of the base station 102 described herein, and also facilitating the overall functionality of the base station 102. The program code running on the controller 132 performs the steps of signal processing methods and performing reverse link management functions of exemplary embodiments.

[0029] Memory 134 is any memory suitable for storing values, parameters, program code and other information in accordance with known techniques. Memory 134 may be implemented in, for example, an integrated circuit (IC).

[0030] Base stations 102-104 transmit control commands via forward link signals 106, 108 to mobile stations 118-122. The control commands can contain any number of parameters, values, bits or other information in accordance with the specific communication standard used in the communication system 100. In the exemplary embodiment, the control commands contain reverse link control parameters that provide

53 / 59P28252EN00 to the mobile station 118 information suitable for determining an authorized reverse link power level (authorized TPR). Exemplary reverse link control parameters include rate control commands and data block allocation messages. Authorized reverse link power level (authorized TPR) is the maximum reverse link power allowed by base station 102 and provides base station 102 with a mechanism to control reverse link transmission interference for transmitting other reverse links from other mobile stations 120, 122. In addition to the authorized reverse link power level, such as the authorized ratio of traffic signal to pilot signal (authorized TPR), base station 102 transmits other reverse link transmission information, such as reverse link transmission parameters, which includes information enabling base station 118 to maintain transmission guidelines reverse link. Any of several techniques can be used to transfer reverse link transmission parameters. For example, representations of uplink transmission parameters may be transmitted to mobile station 118. Examples of communication systems that are capable of supporting such a mechanism are fully planned CDMA and OFDMA communication systems. Under certain conditions, such as for CDMA systems with rate control, only limited information, such as indications of changes in uplink transmission parameters, may be transmitted. In addition, uplink transmission indicators received by mobile station 118 may identify a set of parameters that are stored in memory 140.

[0031] Although reverse link transmission guidelines may be maintained using any of several techniques, mobile station 118 maintains values ​​in memory 140 determining the relationship of traffic signal to pilot signal (TPR) ratios and data blocks in an exemplary embodiment.

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As discussed below in more detail with reference to FIG. 2-4, reverse link transmission guidelines relate to power levels such as TPR values ​​for at least two quality of service (QoS) levels. In the exemplary embodiment, many standard TPR values ​​correspond to data block sizes for standard transmissions, and many increased TPR values ​​correspond to data block sizes for increased transmissions. The increased TPR values ​​are generally greater than the standard TPR values ​​for the corresponding data block sizes. Based on the size of the reverse link signal data block and the authorized TPR, mobile station 118 selects either standard TPR or increased TPR to transmit the reverse link signal. Although different criteria may be used to select the TPR, mobile station 118 selects the TPR according to the most compatible combination of delay and data block size. For example, mobile station 118 may select a standard TPR in which the specific data block is a relatively large FTP file and a larger delay may be tolerated. On the other hand, mobile station 118 may select an increased TPR in which the data block is a small packet and in which a small delay is preferred. Low latency is often preferred in real-time applications such as video applications.

[0032] When choosing a reverse link power level, mobile station 118 identifies the highest standard power level and the highest boosted power level that meet the authorized power level (AUTH_PWR) reverse link transmission requirements and determines the appropriate data block sizes, taking into account the current data block size and delay preferences. In the exemplary embodiment, the highest standard TPR and the highest increased TPR correspond to those TPRs that are associated with the data block and are used by mobile station 118 for the required quality of service when transmitting the data block. Application to this, the highest standard level

The power level is identified as a standard power level (standard TPR) corresponding to a data block format that is less than or equal to the authorized power level.

The highest increased power level is identified as the increased power level (increased TPR) corresponding to the data block format that is less than or equal to the sum of the standard power level (standard TPR) and the reserve factor (q). The reserve factor introduces a range above the highest standard TPR in which mobile station 118 may transmit a reverse link signal in gain mode. In this way, said range provides a mechanism for reducing quantization effects when the communication system 100 defines a limited number of data block formats. Selecting increased TPR after specifying a standard TPR allows the system 100 to maintain a benchmark for updating authorized TPR. Thus, in communication systems using a rate determination process, a standard data block selection algorithm is established and mobile station 118 may transmit a data block with an increased power level after the standard data block has been identified by the rate determination process. In some conditions, the highest increased power level is directly identified as the increased power level corresponding to the data block, which level is less than the maximum authorized power level.

[0033] FIG. 2 is a table showing sample uplink transmission guidelines 200 in which transmission power levels and uplink data block sizes are represented by alphanumeric variables. The reverse link transmission guidelines 200 define the relationship between the permissible transmission power levels (204, 208) and the many sizes 202, 206 data blocks for at least two QoS (quality of service) classes. As discussed below, uplink transmission guidelines 200 determine transmission power levels (204, 208) in terms of traffic signal power ratios to

Pilot signal (TPR) for a standard service and for a service with gain for several levels 204, 208 of reverse link transmission power in the exemplary embodiment. "Data block" refers to a number of bits of information coded and modulated according to several known formats transmitted on a traffic channel such as a data packet channel (PDCH). The data block can be determined by any combination of parameters indicating the number of bits in the data block, coding efficiency, modulation valence or CRC. Any number of transmission power levels 204, 208 and data sizes 202, 206 can, however, be determined by any of several formats, ratios, and units depending on the implementation of a particular communication system 100. The table in FIG. 2 includes a set of 202 standard data block sizes and a set of 206 sized data block sizes. In the exemplary embodiment, a single set of data block sizes is associated with a set of standard power levels 204 and a set of increased power levels 208 such that each data block size is associated with a standard power level and an increased power level. In the exemplary embodiment, each standard power level value is less than the corresponding increased power level value for the same data block size. Although exemplary reverse link power transmission guidelines 200 are presented as tables, guidelines 200 may be implemented and performed by any of several methods, and relationships between different values ​​need not necessarily be retained as tables in memory.

[0034] As described above, mobile station 118 maintains the authorized transmission power level (AUTH_PWR) of the reverse link that can be transmitted, modified, updated, or otherwise established by the base station 102. Mobile station 118 is authorized to transmit the reverse link signal with any a power level that is less than or equal to the authorized power level

Uplink transmission and that meets the requirements of uplink transmission guidelines 200 for data block size 202, 206 and uplink transmission power 204, 208. In systems using orthogonal reverse link transmissions, the reverse link signal uses the allocated code space as a data rate associated with the subcarriers allocated to the mobile station in the OFDMA system.

[0035] Those skilled in the art will recognize various suitable techniques for communicating reverse link transmission information to mobile stations 118 based on known techniques as set forth herein for teaching purposes. As mentioned above, base station 102 transmits control information over the forward link, which includes reverse link transmission information suitable to maintain reverse link transmission guidelines 200. Any combination of indicators, adaptation indicators and transmitted values, as well as values ​​stored by mobile station 118 may be used to form uplink transmission guidelines 200. For example, values ​​representing uplink transmission parameters may be transmitted directly from base station 102 to mobile station 118 each time guidelines 200 are changed or created. Under certain conditions, only changed values ​​may be transmitted. In other situations, information transmitted from base station 102 may contain only differential values ​​for the reference of the increased power level to the standard power level for the same data block size. In the exemplary embodiment, the single data size set 202, 206 is fixed and is not adapted by information transmitted by the base station. In addition, uplink transmission guidelines 200 are defined by default values ​​before using uplink transmission parameters received from the base station.

[0036] An exemplary technique for establishing uplink transmission guidelines 200 includes determining a set of data sizes and standard power levels in accordance with known techniques and determining a set of increased transmission power levels 208 from uplink parameters obtained from base station 102. FIG. 3 is a table showing exemplary uplink transmission guidelines 200 established using the gain value D received from base station 102. The gain D value indicates the difference between the standard transmission power level 204 and the increased transmission power level 208 for the corresponding data block size 302. Looking at the variables in the third row of the table in FIG. 3, it can be seen that, for example, the power level S3 corresponds to the data block size P3. The increased power level 208 for the data block size P3 equals the sum of S3 and D (S3 + D). In addition to the reverse link parameters required to establish guidelines 200, base station 102 transmits other reverse link transmission information that allows mobile station 118 to determine the appropriate transmission power level for the reverse link signal. An example of additional reverse link information is power reserve (q) that indicates a range above the highest standard power level below the authorized power level at which mobile station 118 may transmit in boost mode. Under certain conditions, qi D values ​​vary depending on the size of the data blocks, although in the exemplary embodiment qi D are constant.

[0037] Other methods for generating increased power levels 208 may include other parameters that provide corresponding relationships between data block sizes and power levels 204, 208. In some situations, uplink parameters may include, for example, a R data block reduction R value indicating a reduction of the data block size from the size of the standard data block to the size

53 / 59P28252EN00 an enhanced data block corresponding to a specific power level.

[0038] Any of several techniques may be used to establish and maintain reverse link transmission guidelines 200. Two examples of techniques are presented immediately below. In the first exemplary technique, mobile station 118 maintains a variable, AUTH_PWR, which represents the reverse link transmission power level authorized by base station 102. Base station 102 can determine and change AUTH_PWR by any combination of assignment message and rate control transmission. Based on AUTH_PWR, mobile station 118 determines the data block format that is authorized for the standard mode using guidelines 200. A suitable method for determining the data block format includes determining the largest data block that corresponds to a standard power level equal to or less than AUTH_PWR. When, for example, AUTH_PWR is greater than S3 but smaller than S4 (S3 <AUTH_PWR <S4), mobile station 118 identifies P3 as the largest allowable standard power level.

[0039] Two examples of selecting the increased payload size are discussed immediately below. In the first example, mobile station 118 calculates the increased power level and corresponding data block size based on the standard power level S3 corresponding to the data block size P3, the increased parameter D and the reserve q. A suitable method for determining the format of an increased data block includes determining the largest data block that corresponds to an increased power level equal to or less than S3 + q. When, for example, S3 + q is greater than the increased power level S2 + D, but less than S3 + D (S2 + D <S3 + q <S3 + D), the mobile station identifies P2 as the largest allowed increased data block size.

[0040] In a second technique, the format of the largest boosted data block is determined directly from AUTH_PWR. If S2 + D <AUTH_PWR <S3 + D, P2 is selected as the largest allowed size of the reinforced data block. Mobile station 118 selects an increased power level or standard power level based on the delay requirements and uplink signal data block size. The first technique is preferred for the second embodiment in scenarios in which the mobile station chooses to transmit in increased mode, but transmits a data block size P1 smaller than the maximum allowed increased data block size P2 due to other restrictions such as power and data restrictions. The first technique uses one-to-one mapping between the selected standard data block format and the reinforced data block format. If mobile station 118 selects transmission from P1 instead of P2 for gain, base station 102 may determine the appropriate standard data block format and update AUTH_PWR based on the standard power level of the data block. In the second technique, the same P3 format of the standard data block can be selected for different AUTH_PWR values, while other formats (e.g. P2 and P3) of the enhanced data block can be selected. The AUTH_PWR variable that is used by mobile station 118 may not be known to base station 102. In this situation, P2 or P3 transmission in gain mode will lead to greater ambiguity in base station 102 determining mobile station AUTH_PWR variable 118.

[0041] In a second technique, mobile station 118 sets transmission guidelines 200 and determines the largest data block size corresponding to the largest standard power level less than or equal to AUTH_PWR and the largest data block size corresponding to the largest increased power level that is less than or equal to AUTH_PWR. Based on the delay requirements and link signal data block

In reverse, mobile station 118 chooses between the largest boosted power level and the largest standard power level. In the second technique, the reserve factor q can be added to AUTH_PWR to determine the largest increased power level (i.e. the largest increased power level <AUTH_PWR + q).

[0042] FIG. 4 is a table representing guidelines 200 containing exemplary values ​​in which 302 data block sizes are represented in information bits and transmission power levels 204, 208 are represented by traffic signal to pilot (TPR) power ratios. Two examples are discussed with reference to FIG. 4 presenting two sample techniques for using the reverse link transmission guidelines to determine the appropriate combination of power level and data block size for the reverse link signal.

[0043] In the example of the first technique, AUTH_PWR is 12.2 dB, D is 2 dB, and q is 0.5 dB. Accordingly, the data block corresponding to the largest standard TPR is 1560 bits because the corresponding standard TPR of 10.1 dB is smaller than the authorized TPR of 12.2 dB, but is larger than the next largest standard TPR of 12.6 dB. Adding 0.5 dB to the largest standard TPR results in 10.6. Accordingly, the largest increased TPR is 9.3 dB, which is the sum of 7.3 dB and 2.0 dB. Mobile station 118 chooses between transmitting a 792 bit data block at 9.3 dB in gain mode and transmitting a 1560 bit data block at 10.1 dB.

[0044] In the example of the second technique, AUTH_PWR is 12.2 dB, D is 2 dB, and q is not used. After mobile station 118 generates or sets reverse link transmission guidelines 200 using parameters, data blocks corresponding to the largest standard TPR and largest increased TPR are determined. Because

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10.1 dB (equivalent to 1560 bits) <12.2 dB <12.6 dB (equivalent to 3096 bits), the largest standard TPR is 10.1, which has a block of data size 1560 assigned. The largest increased TPR is 10, 1 dB because 12.1 dB (corresponding to 1560 bits) <12.2 dB <14.6 dB (corresponding to 3096 bits). Accordingly, the data block size for gain mode is 1560 bits. Mobile station 118 chooses between transmitting a 1560 bit data block at 12.2 dB in gain mode and transmitting a 1560 bit data block at 10.1 dB.

[0045]

In order to efficiently manage reverse link resources, control algorithms are exemplary. be performed by base stations 102 using rate and signaling in rate control may transmit transmission messages, rate control indicators (RCI) or any combination thereof. An example of a suitable technique for rate control is considered below and is described in further detail in the related patent application entitled "METHOD AND APPARATUS FOR CONTROLLING REVERSE LINK DATA RATE OF A MOBILE STATION IN A COMMUNICATION SYSTEM WITH REVERSE LINK COMMON RATE CONTROL" filed May 25, 2004 r. The allotment message is transmitted to mobile station 118 indicating the authorized TPR, and the RCI provides information to be customized include rates of decrease in bit rate (RATE_HOLD) and increase of bit rate (RATE_UP). To facilitate rate control in the exemplary embodiment, the service indicator (QoS indicator) is transmitted from mobile station 118 to base station 102 indicating the type of service used to transmit the data block. A suitable mechanism for transmitting the QoS indicator in a communication system operating in accordance with the CDMA standards in a revised version

TPR. RCI (RATE_DOWN),

D includes transmitting a one-bit pointer in Feedback

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Packet Data Control Channel (R-PDCCH). As you know, R-PDDCCH carries information corresponding to the packet format on the Reverse Packet Data Channel (R-PDCH). The one-bit indicator indicates whether the uplink transmitted signal 110 is transmitted in a standard service (or standard QoS) or in a service with gain (or increased QoS).

[0046] FIG. 5 is a flowchart of a method of managing reverse link resources implemented by mobile station 118 in accordance with an exemplary embodiment of the invention. The method can be implemented both separately and in combination, by computer hardware, software and firmware. An exemplary method described with reference to FIG. 5 is implemented by a mobile station 118 having functional blocks including at least controller 138 and memory 134. As described above, functional blocks identified by mobile station 118 may be implemented using any combination of components, processors and program code, and may be implemented in a single device or distributed over several components or devices.

[0047] In step 502, the reverse power authorized level (AUTH_PWR) is established by the mobile station 118. In the exemplary embodiment, the base station 102 transmits a combination of allocation and rate control messages to maintain the authorized power level (AUTH_PWR) of the reverse link transmission. According to the rate control method, base station 102 may periodically adapt AUTH_PWR by transmitting RCI to mobile station 118.

[0048] At step 504, reverse link transmission information is received from base station 102. Reverse link transmission information includes information, values, parameters or other indicators suitable to establish guidelines 200

Reverse link transmission at the mobile station 118. In the exemplary embodiment, the reverse link information includes at least information regarding the determination of the standard TPR value in accordance with known techniques, as well as information enabling determination of the increased TPR value. Examples of suitable reverse link parameters include gain value D, reserve factor q, maximum number of subpackets for standard transmission, maximum number of subpackets for increased transmission size for transmission in gain mode and authorized TPR. Under certain conditions, other parameters may be transmitted, such as a data block reduction R factor, which indicates a reduction in the number of data block sizes required for increased transmission.

[0049] At step 506, the reverse link transmission guideline 200 is determined based on at least part of the reverse link information. In the exemplary embodiment, the sizes of standard data blocks are stored in memory and are associated with standard power level values ​​and increased transmission power level values ​​based on the received reverse link transmission information. Suitable methods for establishing guidelines 200 include the two exemplary techniques described above with reference to FIG. 3 and FIG. 4. In some situations, other methods and techniques may be used.

[0050] At step 508, the mobile station selects a reverse link transmission power level from a plurality of power levels, comprising at least a maximum standard power level and a maximum increased transmission power level, consistent with the authorized reverse link transmission power level. In the exemplary embodiment, mobile station 118 determines the latency requirement of the packet to be transmitted and determines the power level values ​​for standard and gain mode as well as related data block sizes. Based

At the required QoS of the individual packet, mobile station 118 selects between data block and power level combinations for standard mode and gain mode.

[0051] FIG. 6 is a diagram of a method of managing reverse link resources performed by base station 102 in accordance with an exemplary embodiment of the invention. The method can be implemented both separately and in combination, by computer hardware, software and firmware. An exemplary method described with reference to FIG. 6 is implemented by a base station 102 having functional blocks including at least a controller 132, a transceiver 130 and a memory 134. As described above, the functional blocks identified by the base station 102 can be implemented using any combination of components, processors and computer program code, and can be implemented in a single device or distributed over several components or devices.

[0052] At step 602, the base station transmits the authorized uplink transmission power level to mobile station 118. The base station can transmit any number of allocation messages and rate control indicators (RCI) to maintain the appropriate AUTH_PWR as maintained by mobile station 118.

[0053] At 604, the base station transmits reverse link transmission information, which sets reverse link transmission guidelines 200 at mobile station 118. Reverse link transmission guidelines 200 allow mobile station 118 to select a reverse link transmission power level without requiring further authorization from base station 102 As discussed above, the mobile station chooses between an increased power level and a standard power level.

[0054] Thus, in the exemplary embodiment, mobile station 118 may choose between transmitting a data block with a standard power level and transmitting a smaller block

53 / 59P28252EN00 data with increased power level. Base station 102 sets reverse link transmission guidelines by transmitting reverse link information to mobile station 118. Using guidelines 200, authorized reverse link power level and QoS reverse link packet requirements, mobile station 118 selects the appropriate combination of power level and packet data size for packets reverse link without authorization from base station 102. Accordingly, power levels and uplink data blocks are managed to efficiently allocate uplink resources.

[0055] It is understood that in the context of this description, other embodiments and modifications of the present invention will become readable to those skilled in the art. The above description is illustrative and not limiting. The present invention may be limited only by the claims below, which include all such embodiments and modifications considered in conjunction with the above specification and accompanying drawings. The scope of the invention should therefore be determined not with reference to the above description, but should be determined with reference to the appended claims.