Method and system for supporting multiple hybrid automatic repeat request processes per transmission time interval

Method and system for supporting multiple hybrid automatic repeat request procedures every time interval

Method and System for Supporting Multiple Hybrid Automatic Repeat Request Processes Per Transmission Time Interval

The present invention relates to a wireless communication system. In particular, the present invention relates to a method and system for supporting multiple hybrid automatic repeat request (H-ARQ) processes in each transmission time interval (TTI).

Currently, the Third Generation Partnership Project (3GPP) is considering the long-term evolution of 3GPP in order to provide new wireless storage for improved systems with high data rates, low latency, and packet optimization with high capacity and better coverage. Take the network. LTE is the evolution of the wireless interface (that is, the Evolved Universal Terrestrial Radio Access (UTRA)) and the wireless network architecture (that is, the Evolved Universal Terrestrial Radio Access Network (UTRAN)). Currently, Orthogonal Frequency Division Multiple Access (OFDMA) and Single Carrier Frequency Division Multiple Access (SC-FDMA) are proposed as air interface technologies used in downlink and uplink transmissions, respectively.

At the same time, 3GPP High-Speed Packet Access Evolution (HSPA+) is also recommended to increase the capacity and coverage of 3GPP wireless access networks. In HSPA+, the evolution of wireless interface and wireless network architecture is being considered. In HSPA+, the air interface technology is still based on code division multiple access (CDMA), but this technology has features including independent channel coding (differentiated with respect to channel quality) and multiple input multiple output (MIMO). More effective physical layer architecture.

H-ARQ has been adopted by several wireless communication standards including 3GPP and 3GPP2. In addition to the automatic repeat request (ARQ) function of the radio link control (RLC) layer, H-ARQ also provides improved throughput and performance for link adaptation errors and rate control. Asynchronous H-ARQ is used in high-speed downlink packet access (HSDPA), and synchronous H-ARQ is used in high-speed uplink packet access (HSUPA).

The conventional H-ARQ scheme is a single H-ARQ scheme, in which the transmitter transmits only one transmission block (TB) through the H-ARQ process in each TTI. With the introduction of link adaptation mechanisms that rely on physical resources in LTE or HSPA+, the conventional H-ARQ signal transmission mechanism (that is, the signal transmission mechanism used for a single H-ARQ) cannot meet the requirements of multiple transmissions on each TTI. One H-ARQ process to send multiple TBs.

Therefore, it is more desirable to provide a method and system that supports multiple H-ARQ processes and simultaneously transmits multiple TBs on each TTI.

The present invention relates to a method and system for supporting multiple H-ARQ processes on each TTI. The transmitter and receiver contain multiple H-ARQ processes. Each H-ARQ process receives and transmits one TB in each TTI. The transmitter generates multiple TBs and allocates each TB to a specific H-ARQ process. The transmitter sends control information for the assigned H-ARQ process and the associated TB to the receiver. The transmitter uses the allocated H-ARQ process to simultaneously transmit TBs on each TTI. After receiving the TB, the receiver sends feedback of each H-ARQ process and the associated TB to the transmitter, where the feedback indicates the success of each TB reception. For H-ARQ processes (that is, TBs) that are sent at the same time, the feedback for multiple TBs can be combined. Control information and feedback can be sent via layer 1 control section or layer 2 or layer 3 signal transmission. When MINO is implemented, an H-ARQ process can be assigned to a MIMO stream or codeword. The feedback may include a channel quality indicator (CQI) for each MIMO stream or codeword.

The present invention is applicable to any wireless communication system, including but not limited to 3GPP standard LTE and HSPA+.

Fig. 1 is a block diagram of a system 100 according to the present invention. The system 100 includes a transmitter 110 and a receiver 120. The transmitter 110 and the receiver 120 may be a wireless transmit/receive unit (WTRU) and a Node-B (Node-B), and vice versa. The term "WTRU" includes but is not limited to user equipment (UE), mobile station, fixed or mobile subscriber unit, pager, cell phone, personal digital assistant (PDA), computer or any other user that can operate in a wireless environment equipment. The term "base station" includes but is not limited to Node-B, site controller, access point (AP) or any other peripheral devices that can operate in a wireless environment.

The transmitter 110 includes a plurality of TB processors 112, a plurality of H-ARQ processes 114, and a control information processor 116. Each TB processor 112 receives at least one data stream (for example, at least one media access control (MAC) stream or RLC packet data unit (PDU)), and generates at least one TB. Multiple MAC or RLC PDUs can be multiplexed into one TB. According to the present invention, multiple H-ARQ processes can be used to transmit multiple TBs at the same time in each TTI. The TB processor 112 selects the appropriate transmission format combination (TFC) for each TB based on the link conditions between the transmitter 110 and the receiver 120 (that is, TB size, TB set size, TTI, modulation and coding scheme ( MCS), subcarriers, antenna beams, precoding matrix indication (PMI), cyclic redundancy check (CRC) size, redundancy version (RV), data block to radio resource mapping, etc.). Preferably, a separate CRC is attached to each TB. Then, in each TTI, multiple H-ARQ processes are used to simultaneously send multiple TBs.

The transmitter 110 allocates each TB to a specific H-ARQ process, and simultaneously transmits multiple TBs via the allocated H-ARQ process in each TTI. For example, when using MIMO to simultaneously send several independent spatial data streams (that is, several TBs), then each spatial data stream (that is, one TB) can be assigned an H-ARQ process, and multiple spatial data streams It can be sent simultaneously via multiple H-ARQ processes.

The control information processor 116 is configured to send control information about the TB and the H-ARQ process related to the TB to the receiver 120 in each TTI. The control information includes but is not limited to transmission format and resource indicator (TFRI) and H-ARQ related information. The TFRI includes, but is not limited to, information about the dynamic part of the TFC (including the size of the TB set and the modulation and coding scheme) and physical channel information (that is, channelized coding, subcarriers, and antenna beams mapped with TB in the corresponding TTI ). H-ARQ information includes but is not limited to H-ARQ process ID, H-ARA function ID, and redundancy version. The control information may include rate matching parameters for each TB. The rate matching parameters for each TB can then be obtained from TFRI.

The receiver 120 includes a plurality of TB processors 122, a plurality of H-ARQ processes 124, and a control information processor 126. The control information processor 126 processes the control information received from the transmitter 110. Each H-ARQ process 124 processes one TB in each TTI, so that multiple TBs can be processed simultaneously in each TTI based on the control information received from the transmitter 110. The H-ARQ process 124 (or the control information processor 126) sends a feedback indicating whether each TB is successfully received to the transmitter 110, so that the transmitter 110 can retransmit the failed TB based on the feedback. The TB processor 122 processes the successfully received TB based on the control information.

For simultaneous transmission of the H-ARQ process (that is, TB), the feedback for multiple TBs can be combined. Control information and feedback can be sent via layer 1 control section or layer 2 or layer 3 signal transmission. When MIMO is implemented, the feedback may include the CQI of each MIMO stream or codeword.

Figure 2 shows the transmission of related control information used to simultaneously support multiple H-ARQ processes and multiple TB transmissions in each TTI according to the present invention. The transmitter 110 transmits to the receiver 120 a set of control information 202a-202n for the TB set transmitted in the common TTI. The control information 202a-202n used for simultaneous H-ARQ transmission can be sequentially connected into a single packet.

The control information 202a-202n includes information that associates each control information 202a-202n with a corresponding TB. In conventional wireless communication systems (that is, HSDPA and HSUPA), the control information used for only one TB is passed through a separate control channel in each TTI (that is, the high-speed shared control channel (HS-SCCH) in HSDPA) and The enhanced dedicated entity control channel (E-DPCCH) in HSUPA, and because only one TB is sent in each TTI, there is an implicit association between the sent TB and related control information. However, according to the present invention, since multiple TBs are simultaneously transmitted in one TTI through multiple H-ARQ processes, the control information 202a-202n should include associating each control information 202a-202n with its related TB Related information for. With the associated information, the receiver 220 clearly understands which control information 202a-202n is used for which TB, so that the receiver 220 can use the correct control information 202a-202n to process each TB.

The control information can be sent via the layer 1 control part or layer 2 or layer 3 signal transmission of a TTI. Figure 3 shows an LTE downlink physical layer subframe 300 for data and related control information. The sub-frame 300 includes a data part (indicated by "D") and a control part (indicated by "C"). The control information may be included in the control part of the sub-frame 300. The frame structure of layer 1 for the downlink of HSPA+ is based on CDMA technology, which can include independent channelization coding (differentiated with respect to channel quality) and MIMO. With variable TTI, the control part can include control information mapped to data blocks on several subframes. When MIMO is used, the control information can also include the allocation of spatial streams or codewords mapped to different data blocks of different H-ARQ functions in each TTI.

Once the TB is received, the receiver 120 sends separate feedback (ie, positive acknowledgement (ACK) or negative acknowledgement (NACK)) for each TB. FIG. 2 also shows the transmission of feedback 204a-204n for supporting multiple H-ARQ processes in each TTI according to the present invention. Since the multiple feedback transmissions 204a-204n are for different H-ARQ processes from the receiver 120 to the transmitter 110, the transmitter 110 will know which feedback is used for which H-ARQ process (that is, TB). For this kind of association, the H-ARQ process ID (or any other related information) can be included in each feedback 204a-204n to indicate the corresponding H-ARQ process.

Alternatively, if the transmitter 110 and the receiver 120 can maintain and guarantee a predefined pattern or TB sequence associated with the H-ARQ process, then the feedback 204a to 204n can be sent according to the predefined pattern or sequence to Let the transmitter 110 know which feedback corresponds to which H-ARQ process. For example, the feedback can be arranged in ascending power or descending power in comparison with the H-ARQ ID associated with the feedback. This can be determined during call setup. Alternatively, if the receiver 120 successfully receives the TB, the position of the TB feedback can be filled with a dummy packet with a known pattern, so that when the transmitter 110 decodes the feedback packet, the transmitter 110 can determine that the TB has been Successfully received.

For multiple H-ARQ processes (that is, multiple TBs), the feedback 204a-204n can be sequentially connected into a single packet. The number of feedbacks (that is, the number of ACKs and NACKs) connected to a single feedback packet depends on the number of H-ARQ processes used to transmit TB. When the number of feedback increases, more robust MCS, subcarriers, antenna beams, codewords, or higher transmission power can be used to transmit the sequential feedback packets. Due to the importance of this feedback packet, the CRC can be attached to the consecutive feedback packets in order to improve the error correction on the transmitter 110.

This feedback can be included in the control part of the physical layer frame. Figure 4 shows the structure of an LTE uplink physical layer subframe 400. The sub-frame 400 includes a pilot part 402 and a control and data part 404. This feedback can also be included in the control and data section 404 of the subframe 400.

Example

1. A method of using multiple H-ARQ processes in a wireless communication system including a transmitter and a receiver to simultaneously transmit multiple TBs in a TTI, wherein both the transmitter and the receiver include multiple H-ARQs Process in order to handle multiple TBs on each TTI.

2. The method as in embodiment 1, including the following steps: the transmitter generates multiple TBs.

3. The method as in embodiment 2, including the following steps: the transmitter assigns each TB to a specific H-ARQ process.

4. The method according to any one of the embodiments 2 to 3, including the following steps: the transmitter sends the control information for the TB and the H-ARQ process associated with the TB to the receiver.

5. The method as in any one of the embodiments 3 to 4, including the following steps: the transmitter uses the H-ARQ process assigned to the TB on each TTI while simultaneously transmitting the TB.

6. The method of any one of embodiments 4 to 5, wherein the control information includes a TFRI for each TB.

7. The method of embodiment 6, wherein the rate matching parameters for each TB are obtained from TFRI.

8. The method of any one of embodiments 6 to 7, wherein the control information further includes rate matching parameters for each TB.

9. The method of any one of embodiments 4-8, wherein the control information includes an H-ARQ process ID assigned to each TB.

10. The method according to any one of embodiments 4-9, wherein the transmitter transmits control information through the control section of layer 1.

11. The method of any one of embodiments 4-9, wherein the transmitter transmits the control information via one of layer 2 signal transmission and layer 3 signal transmission.

12. The method as in any one of embodiments 4-11, wherein the control information for TB is sequential.

13. The method according to any one of embodiments 2-12, further comprising the following steps: attaching a separate CRC to each TB.

14. The method of embodiment 13, further comprising the following steps: as a response to the TB, the receiver sends to the transmitter an H-ARQ feedback indicating whether each TB is successfully received.

15. The method of embodiment 14, wherein the receiver transmits CQI for each MIMO stream or codeword.

16. The method as in any one of embodiments 14-15, wherein the receiver connects the feedback sequence for multiple TBs into a single feedback packet.

17. The method as in any one of embodiments 14-16, wherein the receiver attaches a CRC to the feedback packet.

18. The method of any one of embodiments 16-17, wherein when the number of feedbacks sequentially connected to the feedback packet increases, a more robust link adaptation scheme is used for the feedback packet.

19. The method of any one of embodiments 14-18, wherein the feedback is sent via the control part of layer 1.

20. The method of any one of embodiments 14 to 18, wherein the feedback is sent via one of layer 2 signal transmission and layer 3 signal transmission.

21. The method as in any one of embodiments 14-20, wherein each feedback includes an H-ARQ process identifier, and a corresponding TB is sent via the identifier.

22. The method of any one of embodiments 14-21, wherein the transmitter and receiver implement an asynchronous H-ARQ scheme, whereby the transmitter determines which feedback is used for which H-ARQ process based on a predetermined timing .

23. The method of any one of embodiments 14-22, wherein the transmitter and receiver maintain a predetermined sequence of TBs, and the receiver sends feedback to the TB according to the predetermined sequence.

24. The method of embodiment 23, wherein the receiver inserts a pseudo sequence for a successfully received TB into the sequential feedback packet.

25. The method according to any one of the embodiments 5-24, wherein the transmitter and the receiver respectively include a plurality of transmitting antennas and receiving antennas, so as to implement MIMO, whereby the TB is passed through one or more of the multiple antenna beams. Code words to send.

26. The method of embodiment 25, wherein the transmitter assigns an H-ARQ to each MIMO stream and codeword.

27. The method as in any one of embodiments 1 to 26, wherein the wireless communication system is a 3G LTE system.

28. The method of any one of embodiments 1 to 26, wherein the wireless communication system is HSPA+ in 3GPP.

29. A wireless communication system that uses multiple H-ARQ processes to simultaneously transmit multiple TBs in each TTI.

30. The system of embodiment 29, comprising: a transmitter including multiple H-ARQ processes to simultaneously transmit multiple TBs on each TTI.

31. The system of embodiment 30, wherein the transmitter includes a control information processor configured to send control information about the TB and the H-ARQ process related to the TB.

32. The system of embodiment 31, comprising: a receiver including multiple H-ARQ processes to process multiple TBs at the same time according to the control information, and in response to the TB, send to the transmitter to indicate whether Successfully received every TB of feedback.

33. The system of any one of embodiments 31 to 32, wherein the control information includes a TFRI for each TB.

34. The system of embodiment 33, wherein the rate matching parameter for each TB is obtained from TFRI.

35. The system of any one of embodiments 31 to 34, wherein the control information further includes rate matching parameters for each TB.

36. The system of any one of embodiments 31 to 35, wherein the control information includes an H-ARQ process ID assigned to each TB.

37. The system of any one of embodiments 31 to 36, wherein the control information is sent through the control section of layer 1.

38. The system of any one of embodiments 31 to 36, wherein the control information is transmitted via one of layer 2 signal transmission and layer 3 signal transmission.

39. The system of any one of embodiments 31 to 38, wherein the control information for TB is sequential.

40. The system of any one of embodiments 30 to 39, wherein a separate CRC is attached to each TB.

41. The system as in any one of embodiments 32-40, wherein the receiver connects the feedback sequence for multiple TBs into a single feedback packet.

42. The system of embodiment 41, wherein the receiver attaches a CRC to the feedback packet.

43. The system as in any one of embodiments 41 to 42, wherein when the number of feedbacks sequentially connected to the feedback packet increases, the receiver uses a more robust link adaptation scheme for the feedback packet.

44. The system of any one of embodiments 32 to 43, wherein the feedback is sent via the control part of layer 1.

45. The system of any one of embodiments 32 to 43, wherein the feedback is sent via one of layer 2 signal transmission and layer 3 signal transmission.

46. The system according to any one of embodiments 32 to 45, wherein each feedback includes an H-ARQ process identifier, and a corresponding TB is sent via the identifier.

47. The system of any one of embodiments 32 to 46, wherein the transmitter and receiver implement an asynchronous H-ARQ scheme, whereby the transmitter determines which feedback is used for which H-ARQ process based on a predetermined timing .

48. The system according to any one of embodiments 32 to 47, wherein the transmitter transmits the TB according to a predetermined sequence, and the receiver transmits feedback for the TB according to the predetermined sequence.

49. The system of embodiment 48, wherein the receiver inserts a dummy sequence for a successfully received TB into the sequential feedback packet.

50. The system according to any one of the embodiments 32 to 49, wherein the transmitter and the receiver respectively include a plurality of transmitting antennas and receiving antennas, so as to implement MIMO, whereby the TB is transmitted through one of the multiple antenna beams and the code Word to send.

51. The system of embodiment 50, wherein the transmitter assigns an H-ARQ to each MIMO stream and codeword.

52. The system as in any one of embodiments 50 to 51, wherein the transmitter transmits a CQI for each MIMO stream and codeword.

53. The system of any one of embodiments 29 to 52, wherein the wireless communication system is a 3G LTE system.

54. The system of any one of embodiments 29 to 52, wherein the wireless communication system is a 3GPP HSPA+ system.

55. A device that uses multiple H-ARQ processes to simultaneously transmit multiple TBs in each TTI.

56. The apparatus of embodiment 55, comprising: a plurality of TB processors, wherein each TB processor is configured to generate at least one TB for transmission and process one received TB.

57. The device of embodiment 56, including: multiple H-ARQ processes to simultaneously send and receive multiple TBs on each TTI, and send in response to the received TB to indicate whether each has been successfully received TB's feedback received.

58. The device of embodiment 57, further comprising: a control information processor configured to send and receive control information about the TB and the H-ARQ process related to the TB.

59. The device of embodiment 58, wherein the control information includes a TFRI for each TB.

60. The apparatus of embodiment 59, wherein the rate matching parameter for each TB is obtained from TFRI.

61. The device of any one of embodiments 58 to 60, wherein the control information further includes rate matching parameters for each TB.

62. The device of any one of embodiments 58 to 61, wherein the control information further includes the H-ARQ process ID assigned to each TB.

63. The device of any one of embodiments 58 to 62, wherein the control information is sent through the control section of layer 1.

64. The device of any one of embodiments 58 to 62, wherein the control information is transmitted via one of layer 2 signal transmission and layer 3 signal transmission.

65. The device of any one of embodiments 58 to 64, wherein the control information for the TB is sequential.

66. The device of any one of embodiments 56 to 65, wherein a separate CRC is attached to each TB.

67. The device of any one of embodiments 57 to 66, wherein the feedback is sequentially connected into a single feedback packet.

68. The device of embodiment 67, wherein a CRC is attached to the feedback packet.

69. The device of any one of embodiments 67 to 68, wherein when the number of feedbacks sequentially connected to the feedback packet increases, a more robust link adaptation scheme is used for the feedback packet.

70. The device of any one of embodiments 57 to 69, wherein the feedback is sent via the control part of layer 1.

71. The device of any one of embodiments 57 to 69, wherein the feedback is sent via one of layer 2 signal transmission and layer 3 signal transmission.

72. The device of any one of embodiments 57 to 71, wherein each feedback includes an H-ARQ process identifier, and the corresponding TB is sent via the identifier.

Although the features and elements of the present invention are described in specific combinations in the preferred embodiments, each feature or element can be used alone without other features and elements of the preferred embodiment, or in It can be used in various situations with or without combining with other features and elements of the present invention. The method or flowchart provided by the present invention can be implemented in a computer program, software, or firmware executed by a general-purpose computer or processor, wherein the computer program, software, or firmware is included in a computer-readable storage medium in a tangible manner middle. Examples of computer-readable storage media include read-only memory (ROM), random access memory (RAM), registers, cache memory, semiconductor memory devices, internal hard disks, and removable disks. Magnetic media, magneto-optical media, and optical media such as CD-ROM discs and digital versatile discs (DVD).

For example, suitable processors include: general-purpose processors, special-purpose processors, conventional processors, digital signal processors (DSP), multiple microprocessors, one or more microprocessors associated with the DSP core, Controller, microcontroller, dedicated integrated circuit (ASIC), field programmable gate array (FPGA) circuit, any kind of integrated circuit (IC) and/or state machine.

The processor associated with the software can be used to implement a radio frequency transceiver for use in a wireless transmit and receive unit (WTRU), user equipment, terminal, base station, radio network controller, or any kind of host computer. WTRU can be used in combination with modules implemented in hardware and/or software, such as cameras, camera modules, video phones, speaker phones, vibration devices, speakers, microphones, TV transceivers, hands-free headsets, keyboards, Bluetooth<img file="TWI474663B_D0001.tif" he="67" id="i0001" img-content="character" img-format="tif" inline="no" orientation="portrait" wi="46" />Module, frequency modulation (FM) radio unit, liquid crystal display (LCD) display unit, organic light-emitting diode (OLED) display unit, digital music player, media player, video game console module, Internet browser and / Or any kind of wireless local area network (WLAN) module.

<p>100. . . system</p><p>110. . . launcher</p><p>120. . . receiver</p><p>300, 400. . . Subframe</p><p>TB. . . Transfer block</p><p>H-ARQ. . . Hybrid automatic repeat request</p><p>ACK/NAK. . . Affirmative/Negative Response</p><p>UE. . . User equipment</p>

The present invention can be understood in more detail from the following description, which is provided as an example and is understood in conjunction with the drawings, in which:

Figure 1 is a block diagram of a system supporting multiple H-ARQ processes in each TTI according to the present invention;

Figure 2 shows the transmission of related control information for simultaneously supporting multiple H-ARQ processes and multiple TB transmissions in each TTI according to the present invention;

Figure 3 shows the LTE downlink physical layer frame structure for data and related control information; and

Figure 4 shows the LTE uplink physical layer frame structure for data and related control information.