CN1411244A - Method of realizing data retransmission on high speed medium access control layer (MAC-HS) - Google Patents
Method of realizing data retransmission on high speed medium access control layer (MAC-HS) Download PDFInfo
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- CN1411244A CN1411244A CN 01141645 CN01141645A CN1411244A CN 1411244 A CN1411244 A CN 1411244A CN 01141645 CN01141645 CN 01141645 CN 01141645 A CN01141645 A CN 01141645A CN 1411244 A CN1411244 A CN 1411244A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1887—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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Abstract
This invention is to set up retransmit PDU data array is MSC-HS used in PDU data related to unsuccessful transmit TT1 data block applying HARQ stored in PHY, to add PDU data retransmit dispatch in MAC-HS together with PHY layer retransmit dispatch to realize dispatching retransmit PDU data and unsuccessful transmission but not surpassing the HARQ maximum retransmitting times TT1 data blocks, PDU data packet corresponding to TT1 data block failed in PHY transmission and surpassing HARQ maximum retransmit times returns back to store in retransmit PDUdata array in MAC-HSlayer. MAC-HS layer first dispatches PDU data in the retransmit PDU array and modulate coding and sending according to new channel situation in PHY.
Description
Technical field
The present invention relates to the data hierarchy retransmission technique of wireless communication field, particularly a kind of implementation method of the data re-transmission that increases at high speed medium access control layer (MAC-HS) (MAC-HS).
Background technology
In order to adapt to the high speed wireless data business, high speed downlink packet access technology (High SpeedDownlink Packet Access has been proposed, be called for short HSDPA), comprising self adaptation and coding modulation technique (Adaptive Modulation and Coding, be called for short AMC) and hybrid automatic repeat request technology (HybridAuto Retransmit Request is called for short HARQ).Wherein, the core of AMC technology is to select suitable modulation and coded system (Modulation and Coding Scheme according to the variation of channel conditions, be called for short MCS), under the reasonable situation of channel conditions, use high-order modulating, modulation (64QAM) as 64 amplitudes and phase place combination, code check is 3/4, and special rich the coding (TURBO CODE) can be improved the throughput performance of data transmission bauds and system like this.The core of hybrid automatic repeat request technology (HARQ) is to realize the re-transmission of TTI data block in physical layer (PHY), and so-called TTI data block is meant the data that send at a transmission time interval (TTI).When the recipient finds that when decoding mistake promptly requires transmit leg that this misdata is retransmitted, faster than the speed that requires at high level to retransmit like this.The employing of HARQ technology has improved the correctness of transfer of data.
In high-speed data service, the communications protocol layers relevant with data retransmission scheduling mechanism is wireless chain control layer (RLC), high speed medium access control layer (MAC-HS) (MAC-HS) and physical layer (PHY), and total concerns referring to shown in Figure 1.Wherein, the execution of HARQ data re-transmission realizes that in physical layer scheduling realizes in MAC-HS.The scheduling of data re-transmission realizes in the following manner:
1, protocol Data Unit (PDU) data cut apart of wireless chain control layer (RLC) after high speed medium access control layer (MAC-HS) (MAC-HS) scheduling, are dressed up the TTI data block in physical layer according to the MCS encode seal of delivery time;
2, physical layer (PHY) uses HARQ mechanism that this TTI data block is transmitted, and when the recipient failed correctly to receive, this TTI data block was transmitted again, surpasses maximum retransmission and then abandons this TTI data;
3, recipient's rlc layer sends the re-transmission requirement that does not correctly receive data, and the rlc layer of transmit leg resends the incorrect PDU data that receive.
Analysis to above-mentioned prior art data retransmission scheme has following problem as can be seen:
The time delay of data retransmission is too big: the rlc layer of transmit leg is realized in radio network controller (RNC), MAC-HS realizes in base station (Node B), the transmission delay of PDU data from RLC to MAC-HS is 100 milliseconds (ms), and the time interval (TTI) that data send among the HSDPA is 2ms, therefore, the time delay of the data retransmission that RLC peer-entities layer is initiated is very big, directly influences the transmission speed of data.
Retransmission information does not change with channel situation (MCS selection): realize what HARQ retransmitted in physical layer (PHY), it is re-transmission to the TTI data block after a plurality of PDU digital coding, the MCS coded message of this data block is constant when retransmitting, therefore can't the adaptive channel situation by the situation of good variation, even constantly increase the HARQ number of retransmissions in this case, the possibility that retransmits failure is also very big.
Summary of the invention
Purpose of the present invention just is to provide a kind of implementation method in high speed medium access control layer (MAC-HS) increase PDU data re-transmission, to improve the retransmission performance of data in high-speed transfer.
The present invention is a kind of to realize data retransmission method at high speed medium access control layer (MAC-HS), and in the data re-transmission mechanism that is applied to be made up of wireless chain control layer, high speed medium access control layer (MAC-HS) and physical layer, this method may further comprise the steps at least:
In high speed medium access control layer (MAC-HS), set up to retransmit PDU data queue, be used to leave in physical layer and adopt and mix automatic repeat requests (HARQ) and still fail the pairing PDU data of TTI data block of transmission success;
In high speed medium access control layer (MAC-HS), increase the PDU data retransmission scheduling, the unsuccessful transmission of the PDU data deposited in the above-mentioned re-transmission PDU data queue and physical layer being deposited with the physical layer retransmission scheduling but the TTI data block that surpasses the HARQ maximum retransmission realizes scheduling.
Described physical layer retransmission scheduling comprises at least:
When receiving the signaling that TTI data block that the recipient feeds back does not correctly receive, dispatch this TTI data block and transmit again in physical layer;
After the number of retransmissions of TTI data block reaches the HARQ maximum retransmission, in the re-transmission PDU data queue of the pairing PDU deposit data of this TTI data block in high speed medium access control layer (MAC-HS).
Described PDU data retransmission scheduling comprises at least:
Judge to retransmit in the PDU data queue whether have the PDU data;
If any the PDU data in this formation of priority scheduling then, select suitable modulation and the modulation of coded system recompile to send according to current channel conditions in physical layer;
When forming a TTI data block, then call new PDU data, select suitable modulation and coded system coded modulation to send according to current channel conditions in physical layer from wireless chain control layer as the PDU data in nothing or this formation are not enough.
Described PDU data retransmission scheduling further comprises:
One PDU data retransmission scheduling counter is set, when the PDU data in the scheduling re-transmission PDU data queue resend, judges that at first whether this PDU data retransmission scheduling count value is greater than predefined maximum retransmission value;
As be not more than and then dispatch these PDU data and resend, PDU data retransmission scheduling count value adds 1 simultaneously;
As greater than then reporting wireless chain control layer, initiate to retransmit by wireless chain control layer.
According to the invention described above technical scheme, when physical layer adopts mixing automatic repeat requests (HARQ) technology to carry out the TTI transmission of data blocks, select less maximum retransmission value, with the variation of adaptive channel situation, improve the correctness of data retransmission.
The present invention is the data re-transmission mechanism of being made up of wireless chain control layer, high speed medium access control layer (MAC-HS) and physical layer of introducing in high-speed data service, and introduce physical layer hybrid automatic repeat request technology (HARQ) and automatically modulation and coding techniques (AMC) afterwards, in the implementation method of the PDU data re-transmission of high speed medium access control layer (MAC-HS) increase.Realized the coordinated scheduling of physical layer retransmission and PDU data re-transmission at high speed medium access control layer (MAC-HS) by the inventive method, and can be according to channel conditions, in time adjust the MCS coding that retransmits the PDU data, both reduced the time-delay of data re-transmission, improved adaptability again to channel conditions, strengthen the reliability of data re-transmission, improved the data transmission bauds and the throughput performance of system, thereby further improved the overall performance of system.
Description of drawings
Fig. 1 is and the relevant communications protocol layers schematic diagram of data retransmission scheduling mechanism;
Fig. 2 is a schematic block diagram of realizing the PDU data re-transmission at high speed medium access control layer (MAC-HS);
Fig. 3 is high speed medium access control layer (MAC-HS) physical layer retransmission and PDU data retransmission scheduling schematic flow sheet.
Embodiment
For making purpose of the present invention, technical scheme and beneficial effect clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is further elaborated.
At first increase the structure signal of data re-transmission and scheduling referring to MAC-HS layer shown in Figure 2.
The communications protocol layers relevant with data retransmission scheduling mechanism is wireless chain control layer (RLC), high speed medium access control layer (MAC-HS) (MAC-HS) and physical layer (PHY).
The present invention increases at high speed medium access control layer (MAC-HS) (MAC-HS) to retransmit PDU data queue, is used to deposit the pairing PDU data of TTI data block that physical layer (PHY) surpasses maximum HARQ number of retransmissions.
PDU data that MAC-HS deposits this formation and physical layer deposit unsuccessful transmission but the TTI data that do not surpass the HARQ maximum retransmission realize scheduling.
After MAC-HS receives recipient's repeat requests, at first check the re-transmission TTI data queue in the physical layer, when TTI data block number of retransmissions is not more than maximum retransmission, dispatch it in physical layer retransmission; After TTI data block number of retransmissions reaches maximum retransmission, then the PDU data in this TTI data block are returned the re-transmission PDU data queue of high speed medium access control layer (MAC-HS) MAC-HS.
Reschedule and send into physical layer and carry out new MCS by new channel conditions and select for leaving the PDU data that retransmit in the PDU data queue in, select the modulation of only modulation and coded system recompile, forms new TTI data block transmission.
So just realized at the MAC-HS layer the re-transmission of PDU data and the scheduling of two-layer re-transmission.
Utilize the mode of data re-transmission that MAC-HS increases and physical layer retransmission combination can select the maximum retransmission of less HARQ, utilize the data re-transmission of MAC-HS can increase conformability channel.MCS information during HARQ retransmits is constant, selects under the situation of MCS code error in channel conditions variation or AMC, and the success rate that HARQ retransmits is very low.Modulating-coding is with the variation of adaptive channel again these PDU data that retransmit failure for the MAC-HS data re-transmission, and the probability that success is transmitted is much bigger.
And the PDU data that the TTI data of HARQ re-transmission failure comprise are the less PDU data of sequence number of recipient RLC reorganization needs certainly, it is necessary at the MAC-HS layer these data being realized retransmitting as early as possible, can realize the priority scheduling of these packets in this way, reduce these PDU data are initiated re-transmission from RLC time delay.
The scheduling flow of MAC-HS physical layer retransmission and PDU data re-transmission is referring to shown in Figure 3.Check at first whether retransmit PDU data queue is empty, the PDU data that judge whether unsuccessful transmission exist, having then, priority scheduling retransmits these PDU packets, if the scheduling times of PDU data re-transmission surpasses maximum retransmission N2 then reports wireless chain control layer RLC, initiate transmission again by rlc layer.If do not have to surpass then the PDU data are that new TTI data block sends at physical layer PHY according to new MCS recompile again.If do not have the not enough TTI data block of reorganization of the PDU data of unsuccessful transmission or PDU data then call new PDU data from radio link layer RLC.Scheduling resends if the TTI data block sends unsuccessful, send number of times and then be bust this above HARQ maximum retransmission N1, PDU data are wherein returned the re-transmission PDU data queue that is stored in high speed medium access control layer (MAC-HS) MAC-HS layer and are waited the PDU retransfer scheduling.
The invention provides a kind of implementation method, can have the following advantages in conjunction with the variation of channel conditions and the mechanism of HARQ in MAC-HS layer increase PDU data re-transmission:
1, at the MAC-HS layer PDU data is realized retransmitting, reduce abandoning of PDU data, thereby reduce the re-transmission of the PDU data of rlc layer, reduce the time-delay of PDU data re-transmission, improve the system throughput performance.
2, realize the PDU data re-transmission at the MAC-HS layer, to the PDU data of unsuccessful transmission modulating-coding again can adaptive channel situation (MCS selections) variation, the correctness of raising data retransmission.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (5)
1, a kind of in high speed medium access control layer (MAC-HS) realization data retransmission method, in the data re-transmission mechanism that is applied to form, it is characterized in that this method may further comprise the steps at least by wireless chain control layer, high speed medium access control layer (MAC-HS) and physical layer:
In high speed medium access control layer (MAC-HS), set up to retransmit PDU data queue, be used to leave in physical layer and adopt and mix automatic repeat requests (HARQ) and still fail the pairing PDU data of TTI data block of transmission success;
In high speed medium access control layer (MAC-HS), increase the PDU data retransmission scheduling, the unsuccessful transmission of the PDU data deposited in the above-mentioned re-transmission PDU data queue and physical layer being deposited with the physical layer retransmission scheduling but the TTI data block that surpasses the HARQ maximum retransmission realizes scheduling.
2, according to claim 1 in high speed medium access control layer (MAC-HS) realization data retransmission method, it is characterized in that described physical layer retransmission scheduling comprises at least:
When receiving the signaling that TTI data block that the recipient feeds back does not correctly receive, dispatch this TTI data block and transmit again in physical layer;
After the number of retransmissions of TTI data block reaches the HARQ maximum retransmission, in the re-transmission PDU data queue of the pairing PDU deposit data of this TTI data block in high speed medium access control layer (MAC-HS).
3, according to claim 1 in high speed medium access control layer (MAC-HS) realization data retransmission method, it is characterized in that described PDU data retransmission scheduling comprises at least:
Judge to retransmit in the PDU data queue whether have the PDU data;
If any the PDU data in this formation of priority scheduling then, select suitable modulation and the modulation of coded system recompile to send according to current channel conditions in physical layer;
When forming a TTI data block, then call new PDU data, select suitable modulation and coded system coded modulation to send according to current channel conditions in physical layer from wireless chain control layer as the PDU data in nothing or this formation are not enough.
4, realize data retransmission method according to the described of claim 3 at high speed medium access control layer (MAC-HS), it is characterized in that described PDU data retransmission scheduling further comprises:
One PDU data retransmission scheduling counter is set, when the PDU data in the scheduling re-transmission PDU data queue resend, judges that at first whether this PDU data retransmission scheduling count value is greater than predefined maximum retransmission value;
As be not more than and then dispatch these PDU data and resend, PDU data retransmission scheduling count value adds 1 simultaneously;
As greater than then reporting wireless chain control layer, initiate to retransmit by wireless chain control layer.
5, according to claim 1 and 2 in high speed medium access control layer (MAC-HS) realization data retransmission method, it is characterized in that:
Select less HARQ maximum retransmission value,, improve the correctness of data retransmission with the variation of adaptive channel situation.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01141645 CN1225875C (en) | 2001-09-29 | 2001-09-29 | Method of realizing data retransmission on high speed medium access control layer (MAC-HS) |
| PCT/CN2002/000201 WO2003030438A1 (en) | 2001-09-29 | 2002-03-27 | A method realizing data retransmission in the high speed media access control layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 01141645 CN1225875C (en) | 2001-09-29 | 2001-09-29 | Method of realizing data retransmission on high speed medium access control layer (MAC-HS) |
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| CN1411244A true CN1411244A (en) | 2003-04-16 |
| CN1225875C CN1225875C (en) | 2005-11-02 |
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| CN 01141645 Expired - Fee Related CN1225875C (en) | 2001-09-29 | 2001-09-29 | Method of realizing data retransmission on high speed medium access control layer (MAC-HS) |
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| WO (1) | WO2003030438A1 (en) |
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| WO2007090357A1 (en) * | 2006-02-10 | 2007-08-16 | Huawei Technologies Co., Ltd. | A method, device and system for hybrid automatic repeat |
| CN100411330C (en) * | 2004-07-01 | 2008-08-13 | 日本电气株式会社 | Mobile radio communication terminal device |
| CN100433611C (en) * | 2004-03-15 | 2008-11-12 | 华为技术有限公司 | A method for scheduling state report request data unit |
| CN101132258B (en) * | 2006-08-25 | 2010-08-04 | 华为技术有限公司 | Fast response to wireless block receiving, response processing method and wireless block transmission device thereof |
| CN101809926A (en) * | 2007-09-28 | 2010-08-18 | 交互数字专利控股公司 | Method and apparatus for supporting uplink protocol changes |
| CN101095304B (en) * | 2005-01-05 | 2010-10-13 | 诺基亚公司 | Use of the fp header to signal the rnc that the node b has not been able to determine or has not been able to accurately determine the number of retransmissions |
| CN1941671B (en) * | 2005-08-30 | 2010-11-10 | 株式会社Ntt都科摩 | Transmission control method, mobile station, radio base station, and radio network controller |
| WO2010133041A1 (en) * | 2009-05-22 | 2010-11-25 | 中兴通讯股份有限公司 | Method and device for managing hybrid automatic repeat request multi-process data |
| CN1976321B (en) * | 2003-07-02 | 2010-12-29 | 诺基亚公司 | Apparatus, and associated method, for facilitating retransmission of data packets in a packet radio communication system that utilizes a feedback acknowledgment scheme |
| WO2011009312A1 (en) * | 2009-07-21 | 2011-01-27 | 中兴通讯股份有限公司 | Method and device for uplink retransmission decision |
| CN101222479B (en) * | 2007-01-09 | 2011-04-20 | 中兴通讯股份有限公司 | Method for implementing wireless links control layer with active retransmission and period answer |
| CN102208970A (en) * | 2005-10-21 | 2011-10-05 | 美商内数位科技公司 | Method and apparatus for retransmission management for reliable hybrid ARQ process |
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| CN1225875C (en) | 2005-11-02 |
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