CN101500308A - HSDPA medium and high order modulated downlink signaling transmission method for TD-SCDMA system - Google Patents
HSDPA medium and high order modulated downlink signaling transmission method for TD-SCDMA system Download PDFInfo
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Abstract
The invention discloses a transmission method of high-level modulation signaling in an HSDPA (High Speed Downlink Packet Access) of a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system, which overcomes the defect that the high-level modulation mode can not be indicated in the existing communications system. The technical proposal of the invention is as follows: (1) the indication information for the size of a transmission block of a downlink control channel and an uplink control channel is compressed into 5 bits, and the remaining 1 bit and 1 bit of the modulation mode indication information are combined for indicating the high-level modulation mode; (2) a terminal receives the information of the downlink control channel and indicates the resource allocation condition transmitted by the next high-speed downlink shared channel; (3) the channel is measured by the terminal; (4) according to the resource allocation condition of high-speed downlink shared channel and the result of channel measurement, the proper size of the transmission block and the high-level modulation mode are chosen to generate channel quality indication,; (5) the channel quality indication is reported to the base station on the corresponding uplink control channel; and (6) the base station sends the control message which includes the high-level modulation mode to the terminal by the downlink control channel. The invention is applicable to the technical field of mobile communication.
Description
Technical Field
The present invention relates to a signaling transmission method, and in particular, to a transmission method of High-order modulation signaling using a compression method in High Speed Downlink Packet Access (HSDPA).
Background
With the increase of mobile multimedia services, the transmission rate of 2Mb/s of the third generation mobile communication system will not meet the requirement, and it becomes necessary to develop a mobile communication system with larger capacity and larger bit transmission rate. Therefore, WCDMA (Wideband Code Division Multiple Access), CDMA2000 (CDMA 2000) and TD-SCDMA (Time Division-Synchronous Code Division Multiple Access) are all being technically enhanced to develop higher service rates and provide more B3G (later three generations of mobile communication) application services. In the 3GPP standard, HSDPA (High Speed Downlink Packet Access) suitable for WCDMA and TD-SCDMA is proposed based on the UMTS standard. In another standardization organization, 3GPP2, there are similar technologies, CDMA20001X EV-DO and EV-DV.
HSDPA is an enhancement proposed by 3GPP Release 5, mainly aiming at high speed support for packet data services and achieving lower time delay, higher system throughput and more powerful QoS guarantees. From a technical point of view, HSDPA enhances the air interface by introducing a high speed downlink shared channel (HS-DSCH) and enhances the corresponding functional entities in UTRAN. From the bottom level, mainly Adaptive Modulation and Coding (AMC) and H-ARQ (hybrid ARQ) techniques are introduced to increase data throughput.
The H-ARQ system introduces an FEC subsystem in the ARQ system to correct frequently occurring error patterns to reduce the retransmission times, i.e. within the error correction capability, the errors are automatically corrected, and beyond the error correction range, the transmitting end is required to retransmit data, which increases the reliability and transmission efficiency of the system. That is, H-ARQ can automatically adapt to instantaneous channel conditions to provide fine data rate adjustment, and selection of an appropriate modulation and coding scheme is obtained by AMC based on channel conditions measured by the terminal (UE) or determined by the network side. AMC adjusts the modulation and coding scheme according to the change in channel quality conditions within the limits of the system. In an AMC system, users in favorable positions (usually those users that are close to the base station) are given higher modulation and coding schemes (such as 16QAM and 1/2Turbo code rate); users at unfavorable locations (typically those at cell boundaries) are given lower modulation and coding schemes (e.g., QPSK and 1/2Turbo code rates).
The high-speed service bearing of HSDPA mainly realizes transmission by a high-speed downlink shared channel (HS-DSCH), which is a special channel of HSDPA, and all the related bottom layer control information is carried by an uplink HS-DSCH shared information channel (HS-SICH) and a downlink HS-DSCH shared control channel (HS-SCCH). The HS-SCCH is a downlink control channel special for HSDPA, and is a physical channel used for carrying control information of all relevant bottom layers. That is, the terminal must receive the data of the HS-DSCH in cooperation with the HS-SCCH control information. The HS-SCCH is shared by all the UEs for HSDPA data transmission, but for a single HS-DSCH Transmission Time Interval (TTI), each HS-SCCH carries HS-DSCH related downlink control signaling for only one UE.
The signaling carried by the HS-SCCH is as follows: spreading code set information (8 bits) xccs，1，xccs，2，…，xccs，8(ii) a Time slot information (5 bits) xts，1，xts，2，…，xts，5(ii) a Modulation information (1 bit) xms，1(ii) a Transport block size information (6 bits) xtbs，1，xtbs，2，…，xtbs，6(ii) a Hybrid automatic repeat request process information (3 bits) xhap，1，xhap，2，…，xhap，3(ii) a Redundancy version information (3 bits) xrv，1，xrv，2，xrv，3(ii) a New data indication (1 bit) xnd，1(ii) a HS-SCCH cyclic sequence number (3 bits) xhcsn，1，xhcsn，2，xhcsn，3(ii) a UE identity number (16 bits) xue，1，xue，2，…，xue，16。
The HS-SICH channel is an uplink control channel dedicated to HSDPA and is also a physical channel for feeding back related uplink information, and delivers ACK/NACK signaling for supporting H-ARQ to the base station (Node B), while it also transmits Channel Quality Indicator (CQI) for link adaptation. The CQI is used for indicating the quality of the current channel and comprises a recommended transport block size and a recommended modulation mode, and the NodeB determines the transport format of the next transmission according to the CQI.
The signaling carried by HS-SICH is as follows: recommend modulation scheme (RMF) (1 bit) xrmf，1(ii) a Recommended Transport Block Size (RTBS) (6 bits) xrtbs，1，xrtbs，2，…，xrtbs，6(ii) a Hybrid automatic repeat request acknowledgement information ACK/NACK (1 bit) xan，1. From the above, the HSDPA technology of the existing TD-SCDMA system only adopts two modulation methods, QPSK and 16QAMAnd (3) the modulation mode is marked by only one bit in the HS-SCCH and the HS-SICH.
In the AMC system, the transmission power of the base station to each user is kept constant, and for the user with a good location, the channel condition is good, the system can provide high-rate data service to it, and increase the total throughput of the system, but to maximize the transmission capability of the packet data service and increase the system capacity, it is necessary to introduce higher coding rate and higher order modulation mode (such as 32QAM, 64QAM, 256 QAM).
In the current specification, the HSDPA technology of the TD-SCDMA system only supports two modulation modes, QPSK (quadrature phase shift keying) and 16QAM (16-order quadrature amplitude modulation), and the corresponding modulation mode indication information also has only 1 bit, and cannot support HSDPA of higher-order modulation modes (such as 32QAM, 64QAM, and 256 QAM).
Disclosure of Invention
The invention aims to solve the problems, provides a transmission method of HSDPA medium and high order modulation signaling in a TD-SCDMA system, and solves the problem that the prior communication system can not indicate a high order debugging mode.
The technical scheme of the invention is as follows: the invention discloses a method for transmitting HSDPA medium and high order modulation signaling in a TD-SCDMA system, which comprises the following steps:
(1) compressing the transmission block size indication information in the downlink control channel and the uplink control channel into 5 bits, and combining the remaining 1 bit with the 1 bit of the modulation mode indication information to indicate a high-order modulation mode;
(2) the terminal receives the message of the downlink control channel and indicates the resource allocation condition of the next high-speed downlink shared channel transmission;
(3) the terminal carries out channel measurement;
(4) according to the resource allocation condition of the high-speed downlink shared channel in the step (2) and the channel measurement result in the step (3), the terminal selects a proper transmission block size and a high-order modulation mode to generate a channel quality indication;
(5) the generated channel quality indication is reported to a base station at the corresponding uplink control channel;
(6) and the base station sends the control information containing the high-order modulation mode to the terminal through the downlink control channel.
The method for transmitting HSDPA medium and high order modulation signaling in the TD-SCDMA system comprises the following steps (2):
(2.a) the terminal receiving the message of the downlink control channel;
and (2, b) performing de-physical process processing on the message of the downlink control channel, extracting the control information of the high-speed downlink shared channel, analyzing the transmission block size indication information and the modulation mode indication information, and acquiring the high-speed modulation mode of the high-speed downlink shared channel.
The method for transmitting HSDPA medium and high order modulation signaling in the TD-SCDMA system comprises the following steps (3):
(3.a) the terminal receiving the high speed downlink shared channel at the allocated time interval according to the control information of the downlink control channel;
(3.b) the terminal performs channel measurement on the data of the high-speed downlink shared channel;
and (3, c) the terminal demodulates the data on the high-speed downlink shared channel according to the transmission block size indication information and the modulation mode indication information of the downlink control channel.
The above mentioned method for transmitting HSDPA medium and high order modulation signaling in the TD-SCDMA system, wherein the channel quality indicator in step (4) includes a recommended modulation scheme and a recommended transport block size.
The method for transmitting HSDPA medium and high order modulation signaling in the TD-SCDMA system comprises the following steps of (5):
one bit of the recommended modulation mode with 2 bits is repeated 16 times, the other bit and 5 bits of the recommended transmission block size form a new 6 bit, Reed-Muller (32, 6) coding is carried out, and the coded channel quality indication is sent to the base station through corresponding uplink control information.
The method for transmitting the high-order modulation signaling in the HSDPA of the TD-SCDMA system includes: 32QAM, 64QAM, or 256 QAM.
Compared with the prior art, the invention has the following beneficial effects: in the invention, in a high-order modulated HSDPA system, the size indication information of a transmission block in a downlink control channel (HS-SCCH) and an uplink control channel (HS-SICH) is compressed into 5 bits, and in addition, 1 bit and 1 bit of the modulation mode indication information form a new 2-bit indication high-order modulation mode, thereby realizing the control of the high-order modulation mode, enabling the HSDPA system to support the high-order modulation mode and effectively improving the peak transmission rate and the frequency band utilization rate of the system.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for transmitting high-order modulation signaling in HSDPA of TD-SCDMA system according to the present invention.
Fig. 2 is a flow chart of an embodiment of the coding and multiplexing of the downlink control channel (HS-SCCH) of the present invention.
Fig. 3 is a flow chart of an embodiment of the coding and multiplexing of the uplink control channel (HS-SICH) of the present invention.
Fig. 4 is a sub-flowchart of step S14 in the embodiment of fig. 1.
Detailed Description
The invention is further described below with reference to the figures and examples.
Fig. 1 shows a flow of an embodiment of the transmission method of the high-order modulation signaling in the HSDPA of the TD-SCDMA system of the present invention. Referring to fig. 1, the following is a detailed description of each flow step in the transmission method.
Step S10: the transmission block size indication information in the downlink control channel (HS-SCCH) and the uplink control channel (HS-SICH) is compressed into 5 bits (bit), and the other 1 bit is combined with the 1 bit of the modulation mode indication information to indicate a high-order modulation mode (such as 32QAM, 64QAM, 256 QAM).
Step S11: the UE receives a message of a downlink control channel (HS-SCCH) and indicates the resource allocation condition of the next high-speed downlink shared channel (HS-DSCH) transmission.
In this step, the UE receives the HS-SCCH message, performs de-physical process processing on the HS-SCCH message, extracts HS-DSCH control information, and analyzes the high-order or low-order transmission block size indication information and the modulation mode indication information, thereby obtaining the high-order modulation mode of the HS-DSCH.
Step S12: the UE performs corresponding channel measurement.
In this step, the UE receives the HS-DSCH at the allocated time interval according to the control information of the HS-SCCH, performs corresponding channel measurement on the HS-DSCH data, and demodulates the data on the HS-DSCH according to the indication information of the transmission block size of the HS-SCCH and the indication information of the modulation mode.
Step S13: according to the resource allocation condition of the HS-DSCH and the channel measurement result, the UE selects a proper transport block size and a high-order modulation mode to generate a Channel Quality Indicator (CQI). The CQI includes a recommended modulation scheme and a recommended transport block size.
Step S14: the generated CQI is reported to the base station at the corresponding HS-SICH.
In this step, 1 bit in the new 2-bit recommended modulation scheme (RMF) is repeated 16 times, and the other 1 bit and 5 bits of the Recommended Transport Block Size (RTBS) constitute new 6 bits to perform 1-order Reed-Muller (32, 6) coding, and the coded CQI is transmitted to the base station (Node B) through the corresponding HS-SICH.
Step S15: and the base station sends the control information containing the high-order modulation mode to the UE through the HS-SCCH.
In the above embodiment of the present invention, the indication information of the size of the transmission block in the downlink control channel (HS-SCCH) and the uplink control channel (HS-SICH) is compressed into 5 bits, and the other 1 bit and the 1 bit of the modulation mode indication information form a new 2-bit indication high-order debugging mode. There are some differences in the encoding and multiplexing of HS-SCCH and the encoding and multiplexing of HS-SICH.
Fig. 2 shows the flow of HS-SCCH encoding, multiplexing, please refer to fig. 2. The signaling carried by the HS-SCCH in the invention is as follows: spreading code set information (8 bits) xccs，1，xccs，2，…，xccs，8(ii) a Time slot information (5 bits) xts，1，xts，2，…，xts，5(ii) a Modulation information (1 bit) xms，1(ii) a Transport block size information (6 bits) xtbs，1，xtbs，2，…，xtbs，5，xms，2(ii) a Hybrid automatic repeat request process information (3 bits) xhap，1，xhap，2，…，xhap，3(ii) a Redundancy version information (3 bits) xrv，1，xrv，2，xrv，3(ii) a New data indication (1 bit) xnd，1(ii) a HS-SCCH cyclic sequence number (3 bits) xhcsn，1，xhcsn，2，xhcsn，3(ii) a UE identity number (16 bits) xue，1，xue，2，…，xue，16. The transmission block size information is compressed into x from the original 6 bits informationtbs，1，xtbs，2，…，xtbs，55 bits of (1), and the other x bitsms，2And 1 bit x of modulation mode informationms，1Collectively indicating a high order modulation scheme.
Step S20: and multiplexing HS-SCCH information. Wherein,
a1，a2...a8＝xccs，1，xccs，2...xccs，8
a9，a10...a13＝xts，1，xts，2...xts，5
a14＝xms，1
a15，a16...a20＝xtbs，1，xtbs，2...xtbs，5，xms，2
a21，a22，a23＝xhap，1，xhap，2，xhap，3
a24，a25，a26＝xrv，1，xrv，2，xrv，3
a27＝xnd，1
a28，a29，a30＝xhcsn，1，xhcsn，2，xhcsn，3
step S21: CRC (Cyclic redundancy check) is attached, and CRC check bits of length 16 and UE identity x of length 16 are identifiedue，1，xue，2，...xue，16Performing modulo-2 addition to add the obtained sequence to the input sequence a1，a2，...aAThen, an output bit b is obtained1，b2，...bB。
Step S22: channel coding, using 1/3 convolutional coding on input bit b1，b2，...bBCoding to obtain output bit c1，c2，...cc。
Step S23: rate matching, same as the rate matching method of the common service channel, and outputting f1，f2，...fR。
Step S24: the interleaving of HS-SCCH is the same as the interleaving method of common service channel, and v is output1，v2，...vR。
Step S25: dividing the physical channel, dividing the input bit into two segments with length of 84 and 88 bits, and outputting 。
Step S26: and physical channel mapping, namely mapping the two sections of data to corresponding physical channels respectively.
Fig. 3 shows the flow of encoding and multiplexing of HS-SICH, please refer to fig. 3. The signaling carried by the HS-SICH in the invention comprises the following steps: recommend modulation scheme (RMF) (1 bit) xrmf，1(ii) a Recommended Transport Block Size (RTBS) (6 bits) xrtbs，1，xrtbs，2，…，xrtbs，5，xrmf，2(ii) a Hybrid automatic repeat request acknowledgement information ACK/NACK (1 bit) xan，1。
Step S30: for Recommended Modulation (RMF) xrmf，1And a Recommended Transport Block Size (RTBS) xrtbs，1，xrtbs，2，…，xrtbs，5，xrmf，2CQI coding is carried out to obtain Z1，Z2，......，ZnCQI。
Step S31: simultaneously with step S30. Acknowledgement information ACK/NACK (1 bit) x for hybrid automatic repeat requestan，1Performing ACK/NACK coding to obtain C1，C2，......，C36。
Step S32: and multiplexing HS-SICH, and cascading the CQI information and the HARQ information. Wherein,
d1，d2...dnCQI＝z1，z2...znCQI
dnCQI+1，dnCQI+2...dnCQI+36＝c1，c2...c36
dnCQI+37，dnCQI+38...du＝0，0...0
step S33: HS-SICH interleaving with the same interleaving method as the common service channel and the output of v1，v2…vu。
Step S34: and physical channel mapping, namely mapping the data bits onto the physical channels.
Fig. 4 shows the process of step S14 in the embodiment of fig. 1, please refer to fig. 4. The CQI in the uplink control channel HS-SICH comprises an RTBS and an RMF.
Step S40: 1 bit (x) in new 2-bit RMFrmf，1) Repeating the reaction for 16 times to obtain Z37，Z38，......，Z48。
Step S41: simultaneously with step S40. Another bit (x) in the RMFrmf，2) And 5 bits (x) of RTBSrtbs，1，......，xrtbs，5) Forming new 6 bits, and performing Reed-Muller (32, 6) coding to obtain Z1，Z2，......，Z36。
Step S42: the CQI information is multiplexed, and the coded CQI is sent to a base station (Node B) through a corresponding HS-SICH.
The invention is characterized in that: without changing any control information of HS-SCCH and HS-SICH, the size indication information of the transmission block is compressed into 5 bits, and the other 1 bit and the 1 bit of the modulation mode indication information form a new 2 bit, thereby effectively indicating the high-order modulation mode, realizing the uplink and downlink signaling transmission of the HSDPA high-speed packet service containing the high-order modulation mode, and improving the transmission performance of the system and the utilization rate of the frequency band.
The above-described embodiments are provided to enable persons skilled in the art to make or use the invention, and modifications or variations may be made to the above-described embodiments by persons skilled in the art without departing from the inventive concept of the present invention, and therefore the scope of protection of the present invention is not limited by the above-described embodiments but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (6)
1. A method for transmitting HSDPA medium and high order modulation signaling in a TD-SCDMA system comprises the following steps:
(1) compressing the transmission block size indication information in the downlink control channel and the uplink control channel into 5 bits, and combining the remaining 1 bit with the 1 bit of the modulation mode indication information to indicate a high-order modulation mode;
(2) the terminal receives the message of the downlink control channel and indicates the resource allocation condition of the next high-speed downlink shared channel transmission;
(3) the terminal carries out channel measurement;
(4) according to the resource allocation condition of the high-speed downlink shared channel in the step (2) and the channel measurement result in the step (3), the terminal selects a proper transmission block size and a high-order modulation mode to generate a channel quality indication;
(5) the generated channel quality indication is reported to a base station at the corresponding uplink control channel;
(6) and the base station sends the control information containing the high-order modulation mode to the terminal through the downlink control channel.
2. The method of claim 1, wherein the step (2) comprises:
(2.a) the terminal receiving the message of the downlink control channel;
and (2, b) performing de-physical process processing on the message of the downlink control channel, extracting the control information of the high-speed downlink shared channel, analyzing the transmission block size indication information and the modulation mode indication information, and acquiring the high-speed modulation mode of the high-speed downlink shared channel.
3. The method of claim 2, wherein the step (3) comprises:
(3.a) the terminal receiving the high speed downlink shared channel at the allocated time interval according to the control information of the downlink control channel;
(3.b) the terminal performs channel measurement on the data of the high-speed downlink shared channel;
and (3, c) the terminal demodulates the data on the high-speed downlink shared channel according to the transmission block size indication information and the modulation mode indication information of the downlink control channel.
4. The method of claim 3 wherein the channel quality indicator of step (4) includes a recommended modulation scheme and a recommended transport block size.
5. The method of claim 4, wherein the step (5) comprises:
one bit of the recommended modulation mode with 2 bits is repeated 16 times, the other bit and 5 bits of the recommended transmission block size form a new 6 bit, Reed-Muller (32, 6) coding is carried out, and the coded channel quality indication is sent to the base station through corresponding uplink control information.
6. The method of any of claims 1 to 5, wherein the high-order modulation signaling transmission method in the TD-SCDMA system HSDPA comprises: 32QAM, 64QAM, or 256 QAM.
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| CN102256355A (en) * | 2010-05-19 | 2011-11-23 | 鼎桥通信技术有限公司 | High speed-physical downlink shared channel (HS-PDSCH) transmission method and device in high speed downlink packet access (HSDPA) |
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