CN101924618A - Implementation method of HARQ in TD-HSUPA - Google Patents
Implementation method of HARQ in TD-HSUPA Download PDFInfo
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Abstract
The invention discloses an implementation method of HARQ in TD-HSUPA. An MAC layer allocates HARQ ID for an MAC-e PDU data packet, sets a retransmission sequence number (RSN) and sends the data, the HARQ ID and the RSN to a physical layer together, and simultaneously, the data is saved in the MAC layer; the physical layer selects a channel coding mode according to the RSN and sends the data and the HARQ ID to the network end together, and simultaneously, the HARQ ID is saved; and the physical layer receives an ACK/NACK instruction on a specific E-HICH channel and reports the instruction and the HARQ ID to the MAC layer, and the MAC layer retransmits the data according to the instruction. In the method of the invention, the transmission data of the HARQ is only saved by the MAC layer, and a copy is not saved in the physical layer, thereby greatly lowering the requirement for memory resources of the physical layer; and simultaneously, the MAC layer allocates the HARQ ID, thereby being favorable for preferentially scheduling the HARQ data block needing to be retransmitted in the process of retransmitting data by a terminal. On the basis of meeting the requirement of Uu interface communication, the implementation method is convenient for treating the MAC layer and the physical layer, so that the data transmission control flow of the HARQ of the HSUPA is clear, and actual hardware and software can be implemented easily.
Description
Technical field
The present invention relates to the 3G (Third Generation) Moblie technology, the high speed uplink packet that specially refers to TDS-CDMA system (being called for short TD-SCDMA) inserts a kind of implementation method of the automatic repeat requests of mixing (being called for short HARQ) in (being called for short TD-HSUPA).
Background technology
HARQ in HSUPA has adopted and has stopped waiting the re-transmission mode to carry out, HARQ is based on synchronous descending affirmation/non-affirmation (being called for short ACK/NACK), and can there be 8 HARQ to carry out transfer of data simultaneously, wherein 4 HARQ transmission that the HARQ process is fixed for dispatching, the operable scope 0～3 of their HARQ process identification (PID) (being called for short HARQ ID), 4 is non-scheduling HARQ process, and HARQ ID is 4～7, and the HARQID of scheduling and non-scheduling HARQ can not use with.In data transmission procedure, can there be a plurality of HARQ processes to activate simultaneously.
1HARQ operation principle map analysis with reference to the accompanying drawings, terminal receives HSUPA and strengthens the dedicated channel absolute grant channel of (being called for short E-DCH) (being called for short E-AGCH) beginning, be separated by after nE-AGCH the time slot at physical uplink channel (the being called for short E-PUCH) transmitting data of E-DCH, wherein the value of nE-AGCH is by network configuration, and minimum is 7.After whenever having carried out E-PUCH transfer of data, go up the affirmation information that receives network at the E-DCH HARQ indicating channel (being called for short E-HICH) of regulation.If E-AGCH has specified a plurality of Transmission Time Intervals (being called for short TTI) Radio Resource, terminal can be transmitted the data of different HARQ processes on different TTI so.
In the HARQ data transmission procedure, adopted up asynchronous system, the down-going synchronous mode is transmitted, and promptly terminal sends in the data on E-PUCH, because the up asynchronous system that adopted then must be carried HARQID in E-DCH ascending control channel (being called for short E-UCCH).But aspect descending, owing to adopted the method for synchronization, so on E-HICH be without any the HARQ id information, the corresponding relation of E-PUCH and E-HICH is determined by time relationship, promptly on E-PUCH, send after the data, go up the information that receives E-HICH at a fixed time, the E-HICH data of this moment are exactly the response to E-PUCH, if terminal is not received confirmation or E-HICH indication unacknowledged information at the E-HICH of appointment, terminal thinks that all network does not correctly receive the upstream data that terminal sends on corresponding E-PUCH.
The realization of the HARQ technology among the TD-HUSPA is mainly finished in end side, TS25.321 medium access control (being called for short MAC) layer standard and TS25.222 channel multiplexing and coding criterion according to 3GPP, the data that the HARQ process need send are prepared at the MAC of upper-layer protocol layer, and the assembling of transmission data is incorporated in the physical layer realization.Do not considering that under the situation that the HARQ packet retransmits, the realization of terminal HARQ technology is very easy to, but when considering the re-transmission of HARQ, the problem complexity very that seems, and HARQ has been proposed the requirement of many reality in the realization of terminal.
Accompanying drawing 2 is according to a handling process describing arrangement among the 3GPP about HSUPA, signaling process and data format to the air interface between terminal and the network (being called for short the Uu interface) in the 3GPP standard have carried out strict definition, and be normal mutual so that the terminal of different manufacturers can be carried out with the network of different system producer.But how terminal is uploaded the control of data management, process do not carry out strict definition.
In the prior art, subscriber equipment (be called for short UE) concentrates on physical layer usually to the processing of HARQ process to carry out, specific as follows:
(1) the MAC layer is sent to physical layer with data after finishing the up enhancing protocol Data Unit of media access control layer (being called for short MAC-e PDU) assembling, usually physical layer is that MAC-ePDU distributes HARQ ID, RSN is set, on the E-PUCH channel, send data, simultaneously buffer memory MAC-e PDU data and corresponding HARQ ID thereof;
(2) physical layer determines that according to receiving corresponding E-HICH result whether this MAC-e PDU network correctly receives, and retransmits thereby determine whether to carry out this MAC-e PDU.
Yet the above-mentioned processing method of prior art exists following problems:
(1) preserve MAC-e PDU by physical layer and can take a large amount of physical layer resources, at present in end side, usually by physical layer buffer memory MAC-e PDU data, and the memory source of the DSP of carrying physical layer operation is very limited, can cause the anxiety of DSP resource like this.
(2) according to the regulation of 3GPP, the scheduling of resource of UE is controlled by the MAC layer, physical layer is not known the operating position of resource, the retransmission process of the distribution of HARQ ID and data is placed on physical layer control may causes conflict on the scheduling of resource, also be unfavorable for the HARQ data that the UE priority scheduling need retransmit.
Summary of the invention
At the problem that HARQ realization among the above-mentioned existing TD-HSUPA exists, the present invention proposes the implementation method of HARQ among a kind of TD-HSUPA.
Technical scheme of the present invention is:
1, the MAC layer is selected available permission resource;
2, the MAC layer carries out the E-TFC selection, determines the size of MAC-e PDU, to RLC application medium access control data flow MAC-d data;
3, the MAC layer is dressed up MAC-e PDU with the MAC-d data set, for MAC-e PDU distributes HARQ ID and RSN is set;
4, the MAC layer sends to physical layer together with MAC-e PDU and HARQ ID, RSN, preserves MAC-e PDU, HARQ ID and RSN information simultaneously;
5, the HARQ ID of physical layer transmission MAC-e PDU data and correspondence thereof simultaneously, preserves HARQ ID to network;
6, physical layer detects the ACK/NACK indication on specific E-HICH
7, physical layer reports MAC together with E-HICH testing result and corresponding HARQ ID;
8, the MAC layer carries out retransmission process according to E-HICH testing result and corresponding HARQID, the RSN that physical layer reports.
Described MAC layer selects available permission resource further to comprise, if terminal is grasped scheduling resource permission and non-scheduling resource permission simultaneously, the MAC layer preferentially uses non-scheduling resource.
E-HICH testing result that described MAC layer reports according to physical layer and corresponding HARQID, RSN carry out retransmission process and further comprise:
If described E-HICH testing result is the ACK confirmation, then the MAC layer is deleted the MAC-e PDU of this HARQ ID correspondence, discharges HARQ ID number;
Otherwise the MAC layer checks whether MAC-e PDU packet number of retransmissions reaches maximum permission number of retransmissions, and in this way, then the MAC layer is deleted the MAC-e PDU of this HARQ ID correspondence, discharges HARQ ID number, otherwise the MAC layer selects new permission resource to retransmit.
The span of wherein said maximum permission number of retransmissions is 0～15, and concrete value is by network configuration.
The new permission resource of described MAC layer selection retransmits further and comprises:
If there is available permission resource, then the MAC layer is directly selected this resource, and RSN is set, and MAC-e PDU data and HARQ ID, the RSN of the corresponding buffer memory of HARQ ID sent to physical layer, preserves new RSN simultaneously;
Otherwise the MAC layer is waited for available permission resource, as obtaining available permission resource in the time in maximum retransmit, then the MAC layer is selected this permission resource, RSN is set, MAC-e PDU data and HARQ ID, the RSN of the corresponding buffer memory of HARQ ID are sent to physical layer, preserve new RSN simultaneously, otherwise, the MAC layer is deleted the MAC-e PDU of this HARQ ID correspondence, discharges HARQ ID number;
Wherein, the described maximum retransmit time obtains the first E-HICH of biography testing result from the MAC layer and begins to calculate, and its span is 10～560ms, and concrete value is by network configuration.
Preferably, the method to set up of described RSN is:
Number of retransmissions n＜=2 o'clock, RSN=n;
Number of retransmissions n＞2 o'clock, RSN=2+ (n%2).
The transmission data of HARQ are only preserved by MAC in the implementation method of HARQ among the TD-HSUPA that the present invention proposes, do not preserve copy in physical layer, saved demand greatly to the physical layer memory source, the data of HARQ transmission are kept at the MAC layer, help terminal when carrying out the re-transmission of MAC layer data, pay the utmost attention to the HARQ data block that scheduling need retransmit, physical layer also becomes single to the processing of HARQ data, only the RSN according to the MAC layer judges in the new data mode still to be that the re-transmission mode is carried out digital coding.
MAC layer and physical layer identify by HARQ ID the management of HARQ and control and discern, in whole process, and the usage policy of MAC layer-management HARQ ID, physical layer only is concerned about whether the data block of HARQ ID correspondence correctly sends and is got final product.
Technical scheme of the present invention is with the HARQ implementation procedure, organically being distributed to MAC layer and physical layer realizes, on the basis of the demand that satisfies the Uu interface communication, make things convenient for simultaneously the processing of MAC layer and physical layer again, make the HARQ Data Transmission Controlling flow process of HSUPA become clear, be easy to actual hardware and software and realize.
Description of drawings
Fig. 1 is a HARQ process schematic diagram
Fig. 2 is the flow chart that the HARQ process data packet retransmits
Fig. 3 is specific embodiment of the invention HARQ process realization flow figure
Fig. 4 is a specific embodiment of the invention MAC layer retransmission process flow chart
Embodiment
For clearly demonstrating technical scheme of the present invention, provide preferred embodiment below and be described with reference to the accompanying drawings.
Specific embodiment
The present embodiment overall procedure is as shown in Figure 3:
1, the UE physical layer is understood the information on the E-AGCH channel, and will separate the information of reading and report the MAC layer, separate the information of reading and comprise: the code channel of network authorization (being called for short CRRI), time slot (being called for short TRRI) and power (being called for short PRRI) and the resource continuous factor (abbreviation RDI);
2, the MAC layer judges whether to exist non-scheduling resource permission, execution in step 3 then in this way, otherwise execution in step 4;
3, the MAC layer is selected spendable non-scheduling resource, execution in step 5;
4, the MAC layer is selected spendable scheduling resource;
5, the MAC layer carries out the E-TFC selection according to the resource of selecting, and determines the size of MAC-e PDU, to RLC application MAC-d data;
6, the MAC layer is dressed up MAC-e PDU with the MAC-d data set, for MAC-e PDU distributes HARQ ID and RSN is set;
Wherein the method to set up of RSN is:
Number of retransmissions n＜=2 o'clock, RSN=n;
Number of retransmissions n＞2 o'clock, RSN=2+ (n%2);
7, MAC sends to physical layer together with MAC-e PDU and HARQ ID, RSN, preserves MAC-e PDU and RSN information simultaneously;
8, physical layer judges whether RSN is 0, execution in step 9 then in this way, otherwise execution in step 10;
9, physical layer is carried out the head coding of delivering a letter, execution in step 11 to MAC-e PDU data;
10, physical layer is carried out the retransfer channel coding to MAC-e PDU data;
11, physical layer sends data on the E-PUCH channel, sends HARQID on E-UCCH, simultaneously, preserves HARQ ID;
12, physical layer detects the ACK/NACK indication on specific E-HICH;
13, physical layer reports MAC together with E-HICH testing result and corresponding HARQ ID;
14, MAC carries out retransmission process according to E-HICH testing result and corresponding HARQID, the RSN that physical layer reports, and this steps flow chart is referring to accompanying drawing 4;
This step further comprises:
141, the MAC layer judges whether the E-HICH testing result that physical layer reports is ACK, execution in step 147 then in this way, otherwise execution in step 142;
142, number of retransmissions n=n+1, MAC layer judge whether MAC-e PDU packet number of retransmissions reaches maximum permission number of retransmissions, and in this way, then execution in step 147, otherwise, execution in step 143;
The span of wherein said maximum permission number of retransmissions is 0～15, and concrete value is by network configuration;
143, the MAC layer judges whether to exist available permission resource, and in this way, then execution in step 144, otherwise execution in step 146;
144, the MAC layer is selected this permission resource;
145, RSN is set, MAC-e PDU data and HARQ ID, the RSN of the corresponding buffer memory of HARQ ID sent to physical layer, preserve new RSN simultaneously, return step 8;
Wherein the method to set up of RSN is:
Number of retransmissions n＜=2 o'clock, RSN=n;
Number of retransmissions n＞2 o'clock, RSN=2+ (n%2);
146, the MAC layer is waited for available permission resource, and as obtaining available permission resource in the time in maximum retransmit, then the MAC layer is selected this permission resource, execution in step 145, otherwise, execution in step 147;
Wherein, the described maximum retransmit time obtains the first E-HICH of biography testing result from the MAC layer and begins to calculate, and its span is 10～560ms, and concrete value is by network configuration.
147, the MAC layer is deleted the MAC-e PDU of this HARQ ID correspondence, discharges HARQID number, finishes this HARQ data upload process.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (5)
1. mix the implementation method of automatic repeat requests in the TD SDMA high speed up packet access system, it is characterized in that, may further comprise the steps:
Media access control layer MAC layer is selected available permission resource, the transformat combination E-TFC that strengthens selects, determine the size of the up enhancing protocol Data Unit MAC-e PDU of media access control layer, to RLC application medium access control data flow MAC-d data;
The MAC layer is dressed up MAC-e PDU with the MAC-d data set, mixes automatic repeat requests HARQ process sign HARQ ID and re-transmission sequence number RSN is set for MAC-e PDU distributes;
The MAC layer sends to physical layer together with MAC-e PDU and HARQ ID, RSN, preserves MAC-e PDU, HARQ ID and RSN information simultaneously;
Physical layer sends the HARQ ID of MAC-e PDU data and correspondence thereof to network, simultaneously, preserves HARQ ID;
Physical layer detects on the HARQ indicating channel E-HICH of specific high speed uplink packet access HSUPA enhancing dedicated channel E-DCH to be confirmed/non-affirmation ACK/NACK indication;
Physical layer reports MAC together with E-HICH testing result and corresponding HARQ ID;
The MAC layer carries out retransmission process according to E-HICH testing result and corresponding HARQ ID, the RSN that physical layer reports.
2. the implementation method of mixing automatic repeat requests in a kind of TD SDMA high speed up packet access system according to claim 1, it is characterized in that, described MAC layer selects available permission resource further to comprise, if terminal is grasped scheduling resource permission and non-scheduling resource permission simultaneously, the MAC layer preferentially uses non-scheduling resource.
3. the implementation method of mixing automatic repeat requests in a kind of TD SDMA high speed up packet access system according to claim 1, it is characterized in that E-HICH testing result that described MAC layer reports according to physical layer and corresponding HARQ ID, RSN carry out retransmission process and further comprise:
If described E-HICH testing result is the ACK confirmation, then the MAC layer is deleted the MAC-e PDU of this HARQ ID correspondence, discharges HARQ ID number;
Otherwise the MAC layer checks whether MAC-e PDU packet number of retransmissions reaches maximum permission number of retransmissions, and in this way, then the MAC layer is deleted the MAC-e PDU of this HARQ ID correspondence, discharges HARQ ID number, otherwise the MAC layer selects new permission resource to retransmit.
The span of wherein said maximum permission number of retransmissions is 0～15, and concrete value is by network configuration;
4. mix the implementation method of automatic repeat requests in a kind of TD SDMA high speed up packet access system according to claim 3, it is characterized in that, the new permission resource of described MAC layer selection retransmits further and comprises:
If there is available permission resource, then the MAC layer is directly selected this resource, and RSN is set, and MAC-e PDU data and HARQ ID, the RSN of the corresponding buffer memory of HARQ ID sent to physical layer, preserves new RSN simultaneously;
Otherwise the MAC layer is waited for available permission resource, as obtaining available permission resource in the time in maximum retransmit, then the MAC layer is selected this permission resource, RSN is set, MAC-e PDU data and HARQ ID, the RSN of the corresponding buffer memory of HARQ ID are sent to physical layer, preserve new RSN simultaneously, otherwise, the MAC layer is deleted the MAC-e PDU of this HARQ ID correspondence, discharges HARQ ID number;
Wherein, the described maximum retransmit time obtains the first E-HICH of biography testing result from the MAC layer and begins to calculate, and its span is 10～560ms, and concrete value is by network configuration.
5. according to the implementation method of mixing automatic repeat requests in claim 1 or the 4 described a kind of TD SDMA high speed up packet access system, it is characterized in that the method to set up of described RSN is:
Number of retransmissions n＜=2 o'clock, RSN=n;
Number of retransmissions n＞2 o'clock, RSN=2+ (n%2).
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