CN102595620A - Method, system and device for semi-persistent scheduling of relay access link - Google Patents
Method, system and device for semi-persistent scheduling of relay access link Download PDFInfo
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Abstract
The invention discloses a method, a system and a device for semi-persistent scheduling of a relay access link, which are used for solving the problem that the existing semi-persistent scheduling method causes increase of transmission delay of data packet on the relay access link and influences the service performance. In the method, after a relay receives the data packet transmitted by a base station by a return link, when the relay determines that the transmission delay of the data packet is greater than a stored threshold according to the retransmission times of the data packet on the return link and the stored RTT (Round-Trip Time) delay of a HARQ (Hybrid Automatic Retransmission Request) of the return path, the relay schedules the data packet at an access subframe outside of the predetermined transmission time through a HARQ process reserved by non-SPS (Semi-Persistent Scheduling). In the embodiment of the invention, for the data packet which causes the overstocked of relay side service queue, a dynamic scheduling method is directly used for scheduling the data packet at the access subframe outside of the predetermined time on the access link, thus, the transmission delay for the access relay to obtain the two-hop user data packet of the service is reduced effectively, and the service performance is improved.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of method for semi-persistently dispatching, system and device of relaying access link.
Background technology
In the relaying cellular system, (Relay Node, RN), the introducing of relaying will effectively promote the throughput of sub-district, and enlarges the coverage of sub-district, improves the performance of Cell Edge User (UE) with at least one relaying will to dispose a base station in the sub-district.Fig. 1 is the structural representation of relay system; The Un interface is the interface between eNB and the RN; The Uu interface is the interface between eNB or RN and the UE; The user can be used as direct-connected user (Macro UE) and inserts eNB and carry out direct communication (eNB → UE), or insert relaying as trunk subscriber or double bounce user (Relay UE) and carry out double bounce trunking traffic (eNB → RN → UE).Link between base station and the relaying is called return link (Backhaul Link), and the link that reaches between relaying and the user between base station and the user is called access link (Access Link).
Fig. 2 is mobile cellular communication (the Long Term Evolution-Advanced of system of future generation; LTE-Advanced) the frame structure sketch map behind the introducing relaying; The radio frames of a 10ms comprises 10 sub-frame in the figure, and wherein DL is a descending sub frame, and UL is a sub-frame of uplink.This 10 sub-frame is divided into the passback subframe again and inserts subframe, is respectively applied for the transfer of data of carrying return link and access link.Relaying receives the packet (Packet) from the base station in descending passback subframe, experience certain processing delay after, after a certain descending access subframe this packet is transmitted to the purpose user terminal.Time division duplex (Timedivision duplex, TDD) configuration is 1 time, it is 6ms that the double bounce user's data wraps in the minimal time delay that the relay experiences.
IP-based voice communication (Voice-over-Internet-Protocol, VoIP) be following Long Term Evolution (Long Term Evolution, LTE) with the LTE-A system in unique carrier of speech business.Speech coder will produce the periodically frequent small data packets that arrives under state of activation, be the VoIP business of 12.2Kb/s for speed for example, whenever will produce the packet that a size is fixed as 40 bytes at a distance from 20ms.All adopt the words of dynamic dispatching for the very little VoIP packet base station of data volume; When the user will cause bigger physical downlink control channel (Physical Downlink Control Channel more for a long time; PDCCH) signaling consumption, thus limited the capacity of system.Therefore; For when saving the control channel expense; Obtain certain channel diversity gain, guarantee the resource utilization of system, at third generation partner program (3rd Generation Partnership Project; (Semi-Persistent Scheduling, SPS) mode is to address this problem 3GPP) to have proposed semi-continuous scheduling among the LTE.The basic thought of semi-continuous scheduling is, the packet of initial transmission is taked continuous dispatching, and the packet that retransmits is taked dynamic dispatching.In order to guarantee backwards compatibility, in the LTE-A system, adopt the semi-continuous scheduling scheme to carry out the professional scheduled transmission of VoIP on the access link between relaying and the terminal too.
Because the return link between base station and the relaying adopts the wireless mode transmission; Therefore retransmitting appears on return link in double bounce user's VoIP packet probably; Influence the professional periodicity of relay VoIP, and bring certain variable time delay for double bounce user's VoIP packet.When adopting traditional semi-continuous scheduling scheme in the relay, will cause the VoIP service queue generation packet of relay to overstock, thereby cause double bounce user's propagation delay time accumulation, influence double bounce user's VoIP performance.
Fig. 3 A is that return link retransmits the process that causes relay VoIP packet to overstock, and sends double bounce user's VoIP packet through return link to relaying at a distance from 20ms because eNB is every, and this moment is based on frame structure shown in Figure 2; When the double bounce user when the minimal time delay that the relay experienced is 6ms, return link mixes automatic repeat requests (Hybrid Automatic Repeat reQuest, round-trip delay (Round-triptime HARQ); RTT) be 10ms, after first packet Packet 1 was successfully received by relaying, relaying returns to eNB confirmed to reply (Acknowledgement; ACK); Relaying inserts subframe at the next one and adopts SPS that this packet and SPS activation signaling are sent to UE constantly, and when first 20ms arrived, eNB sent to second packet Packet 2 of relaying; Because wireless transmission problem; Relaying does not successfully receive this packet, to eNB return negative response (Non-Acknowledgement, NACK); Then the VoIP service queue in next one access subframe moment relay will be sky, can't send data to UE.ENB retransmits second packet Packet 2 behind RTT; Relaying correctly receives this packet, and when second 20ms arrived, eNB adopted continuous dispatching to send the 3rd packet Packet 3 through the passback subframe; And correctly received by relaying; Second packet that in the VoIP service queue of next one access subframe moment relay, comprises newly arrived the 3rd packet and re-transmission, but under the semi-continuous scheduling scheme, relaying can only transmit VoIP packet (40 bytes of fixed size constantly in predefine; The i.e. size of a VoIP packet); Even packet therefore afterwards all transmits correctly, in the service queue of relaying, will overstock two VoIP packets (as overstocking the 3rd and the 4th packet among Fig. 3 A) all the time, cause user's the extra increase 20ms of VoIP data packet transmission time delay.
In addition; Because the problem of the wireless transmission between base station and the relaying; Also possibly overstock three VoIP packets in the service queue of relaying shown in Fig. 3 B; Second data encapsulates and retransmits twice back by the relay reception, and the 3rd data encapsulate re-transmission and once received by the relay, and behind the 3rd 20ms, receive the 4th packet; In the VoIP service queue of next one access subframe moment relay, comprise that three packets are respectively second packet, the 3rd packet and the 4th packet; Because relaying can only transmit the VoIP packet of fixed size constantly in predefine, so cause the propagation delay time of the afterwards all VoIP packets of user all will increase 40ms, had a strong impact on the VoIP performance of services.And,, when this packet is adopted semi-continuous scheduling, also can have the problems referred to above, thereby can increase the propagation delay time of packet, and influence the performance of corresponding service for other the packet of periodic traffic.
Summary of the invention
In view of this; The embodiment of the invention provides a kind of method for semi-persistently dispatching, system and device of relaying access link; Cause the propagation delay time of packet on the relaying access link to increase in order to solve method for semi-persistently dispatching of the prior art, influence the problem of service feature.
The method for semi-persistently dispatching of a kind of relaying access link that the embodiment of the invention provides comprises:
Relaying receives the packet that send the base station on return link;
According to the number of retransmissions of the packet that receives on return link, reach the round-trip delay that the return link of preserving mixes automatic repeat requests HARQ, confirm the propagation delay time of this packet at return link;
When the propagation delay time of this packet during greater than the time delay threshold value of preserving; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling.
The semi-continuous scheduling system of a kind of relaying access link that the embodiment of the invention provides comprises:
The base station is used for sending packet through return link to relaying;
Relaying; Be used for receiving the packet that send the base station through return link; According to the number of retransmissions of the packet that receives on return link; And the return link of preserving mixes the round-trip delay of automatic repeat requests HARQ, confirms the propagation delay time of this packet at return link, when the propagation delay time of this packet during greater than the time delay threshold value of preserving; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling;
The terminal is used to receive the packet of dispatching on this access subframe.
The semi-continuous scheduling device of a kind of relaying access link that the embodiment of the invention provides comprises:
Receiver module is used for receiving packet through return link:
Monitoring modular; Be used for according to the number of retransmissions of packet on return link that receives; And the return link of preserving mixes the round-trip delay of automatic repeat requests HARQ; Confirm the propagation delay time of this packet at return link, the propagation delay time of judging this packet is during greater than the transmission threshold value of preserving, and the notice sending module carries out dynamic dispatching;
Sending module; Be used for notice according to the monitoring modular that receives; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling.
Method for semi-persistently dispatching, system and the device of a kind of relaying access link of the embodiment of the invention; In this method when relaying receives the packet that sends the base station through return link after; According to the number of retransmissions of this packet on return link; And the RTT that preserves confirms the propagation delay time of this packet, when the propagation delay time of this packet during greater than the time delay threshold value of preserving, and this packet of HARQ process scheduling that the access subframe outside the predefine transmission time adopts non-SPS to reserve.Because the packet of re-transmission takes place to return link in embodiments of the present invention; Can constantly this packet not carried out continuous dispatching in predefine; And directly adopt the method for dynamic dispatching this packet to be dispatched in the access subframe of predefine outside the moment; Thereby avoid overstocking of RN end service queue occurring, effectively reduced the propagation delay time of double bounce packet, improved performance of services.
Description of drawings
Fig. 1 is the structural representation of relay system;
Fig. 2 introduces the frame structure sketch map behind the relaying for LTE-A;
Fig. 3 A is that return link retransmits the process that causes relay VoIP packet to overstock;
Fig. 3 B is the sketch map that overstocks three VoIP packets in the service queue of relaying;
The semi-continuous scheduling process of the relaying access link that Fig. 4 provides for the embodiment of the invention;
The detailed process of the semi-continuous scheduling of the relaying access link that Fig. 5 provides for the embodiment of the invention;
Another detailed process of the semi-continuous scheduling of the relaying access link that Fig. 6 provides for the embodiment of the invention;
The receiving course that Fig. 7 provides for the embodiment of the invention based on the dispatching method terminal of above-mentioned access link;
The relaying that Fig. 8 provides for the embodiment of the invention and the deployed position sketch map of base station;
When the relay that Fig. 9 provides for the embodiment of the invention adopts the SPS dispatching method of transmission and relaying access link SPS dispatching method that this programme proposes that packet is dispatched on access link respectively, CDF curve contrast during double bounce user's VoIP packet;
The structural representation of the semi-continuous scheduling system of the relaying access link that Figure 10 provides for the embodiment of the invention;
The structural representation of the semi-continuous scheduling device of the relaying access link that Figure 11 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention is in order effectively to reduce the propagation delay time of packet; Improve the user side performance of services; A kind of method for semi-persistently dispatching of relaying access link is provided; After relaying receives the packet of re-transmission, adopt the mode of dynamic dispatching in this dispatching method, on the access subframe outside the predefine transmission time, adopt non-SPS to reserve the HARQ process and dispatch this packet.Owing in this programme when relaying receives the retransmission data packet may that causes owing to return link wireless transmission reason; Can constantly this packet not carried out continuous dispatching in predefine; And directly adopt the method for dynamic dispatching this packet to be dispatched in the access subframe of predefine outside the moment; Thereby can effectively reduce the propagation delay time of double bounce user data package, improve performance of services.
Below in conjunction with Figure of description, the embodiment of the invention is elaborated.
The semi-continuous scheduling process of the relaying access link that Fig. 4 provides for the embodiment of the invention, this process may further comprise the steps:
S401: relaying receives the packet that send the base station on return link.
Relaying comprises that the base station sends by the correct packet that receives of relaying and base station through at least once retransmitting by the correct packet that receives of relaying first receiving the packet that sends the base station on the return link on return link.
Correctly received the packet of base station transmission on the return link when relaying after, relaying returns ACK information to the base station, and the base station stops to send this packet.When this relaying did not correctly receive the packet that sends the base station on return link, relaying returned nack message to the base station, and the base station retransmits this packet behind RTT.
S402: according to the number of retransmissions of the packet that receives on return link, and the round-trip delay of the return link of preserving, confirm the propagation delay time of this packet at return link.
Because the base station sends to the identification information that each packet of relaying comprises this packet; Promptly this packet is the information of which packet; And relaying is when a certain packet of correct reception; Can return nack message to the base station, so relaying can be confirmed the number of retransmissions of each packet at return link.Simultaneously because known (the TDD configuration 1 time of RTT; Return link RTT is 10ms); So relaying can be confirmed the propagation delay time of each packet at return link; Wherein RTT is the moment that the base station is sent a packet first, and the time interval between the moment of this packet of re-transmission, is generally a set time.This packet the propagation delay time of return link be packet by the correct moment that receives of relaying, be initially transmitted to RN with this packet and hold the poor of the pairing moment.
S403: when the propagation delay time of this packet during greater than the time delay threshold value of preserving; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-SPS reservation of dispatching in this PDCCH signaling.
The time delay threshold value that can preserve in embodiments of the present invention; When relaying receives a certain packet from return link; And its propagation delay time is during greater than the time delay threshold value of preserving; Confirm that this packet is a retransmission data packet may,, reduce the propagation delay time of this packet in order not adopt the continuous dispatching mode to dispatch this packet at the predefine transmission time; Directly dispatch this packet in embodiments of the present invention, promptly on the access subframe outside the predefine transmission time, adopt the PDCCH signaling that this packet is carried out dynamic dispatching through the dynamic dispatching mode.And for SPS in dynamic dispatching distinguish, the HARQ process that non-SPS reserves is adopted in this dynamic dispatching in embodiments of the present invention.
Wherein, Pre-allocation resource and the predefine transformat of descending SPS in the PDCCH signaling of a certain descending sub frame, have been disposed in embodiments of the present invention; Here be referred to as the predefine transmission means, SPS just is activated on this descending sub frame so, here with this descending sub frame constantly; Soon (Transmission Time Interval TTI) is designated as T to the Transmission Time Interval at this descending sub frame place
ActAt this moment, UE will be in the SPS state of activation, and the packet that UE was produced in the period before SPS is released will periodically adopt the predefine transformat to carry out continuous dispatching on pre-allocation resource.Here, the predefine transmission time of n SPS of relaying in the cycle is designated as
T in the above-mentioned formula
PeriodBe the cycle of SPS continuous dispatching, (Radio ResourceControl, RRC) signaling is configured acquisition through Radio Resource control.
In the relaying cellular communication system; Wrap in the problem that the relay service queue that the generation re-transmission is caused on the return link overstocks, the propagation delay time of packet is accumulated in order to eliminate the double bounce user data; In embodiments of the present invention through monitoring the transmission situation of packet on the return link; Packet for time-delay arrival relay after the re-transmission adopts the mode of dynamic dispatching to be transmitted to its purpose user, and service queue experiences extra wait time delay in the relay thereby avoided packet.
The concrete transmission situation that need monitor packet on the return link in embodiments of the present invention owing to the relay is confirmed the propagation delay time of each packet on return link, thereby is confirmed which packet is carried out dynamic dispatching.Therefore need at first to confirm this time delay threshold value in embodiments of the present invention; When confirming this time delay threshold value; Can rule of thumb confirm the first time delay threshold value, this first time delay threshold value is that packet transmits on return link when correctly being received by relaying first, and packet correctly arrives the moment of relaying; And the empirical value of the difference in the moment of this packet of relaying predefine transmission, this empirical value is confirmed as the first time delay threshold value.This first time delay threshold value can be used as the time delay threshold value of this preservation, as the foundation whether packet is carried out dynamic dispatching.
After in relaying, having preserved this time delay threshold value; Because the Radio Link between relaying and the base station is along with the different of time can change; Therefore the accuracy in order to guarantee that this dynamic dispatching is judged can be upgraded this time delay threshold value according to the Radio Link situation between base station and the relaying; Concrete renewal process comprises: when packet when transmission back is correctly received by relaying first on return link; Confirm correctly to be arrived the moment of relaying, and the moment of this packet of relaying predefine transmission is poor, adopts the difference renewal in this moment and preserve the said first time delay threshold value by the correct packet that receives.
Relaying is in order to guarantee real-time; Can periodically adopt said method that the time delay threshold value of self preserving is upgraded; Perhaps for equilibrium; Also can the mean value of this time delay threshold value of repeatedly confirming be upgraded the time delay threshold value of this preservation, concrete implementation procedure can be selected as required flexibly.
After relaying has been preserved the time delay threshold value, when relaying receives each packet, need at first to confirm the propagation delay time of each packet, thereby confirm whether this packet is carried out dynamic dispatching at return link.The concrete packet of working as retransmits; And the better time delay value of the radio link quality between base station and the relaying hour; Or the radio link quality between base station and the relaying is relatively poor; But when packet was correctly received by relaying when transmitting first, because relaying is when receiving this packet, the number of retransmissions of confirming this packet was 0; Therefore confirm that this packet is 0 in the propagation delay time of return link, can think that this packet is to adopt the mode of continuous dispatching to dispatch this packet at the predefine transmission time this moment.
If packet transmission first on return link is not correctly received by relaying; The base station can be sent this packet once more after the RTT of return link; Therefore this packet is by the correct moment that receives of relaying; With this packet should be by the correct moment that receives of relaying (being that packet transmits promptly by the correct moment that receives of relaying first) poor, be the propagation delay time of this packet at return link.And the number of times that this packet can be retransmitted according to this packet in the propagation delay time of return link; And the RTT of the return link preserved of relaying confirms, this concrete packet is the product of the RTT of the number of times that retransmitted of packet and return link in the propagation delay time of return link.
The number of times that relaying is retransmitted at return link according to the packet that receives; And the RTT information of the return link of preserving; Confirm that this packet during greater than the time delay threshold value of preserving, adopts the PDCCH signaling that this packet is carried out dynamic dispatching in the propagation delay time of return link on the access subframe outside the predefine transmission time.And because when on access link, adopting the dynamic dispatching mode that packet is dispatched; Because RN possibly serve a plurality of users; Each quantity for a certain user's data dispatching bag also is limited, when the packet that exists two or more needs to carry out dynamic dispatching simultaneously, in order to effectively reduce the propagation delay time of packet; Need the time delay that need carry out each packet of dynamic dispatching be compared, select the maximum packet of time delay at first to carry out dynamic dispatching.
Time time-delay at each packet that relatively needs dynamic dispatching; Need to confirm that this need carry out the time delay of each packet of dynamic dispatching; Concrete is confirming the time time-delay of each packet; Can be according to each packet of confirming wait time delay T in formation after the propagation delay time of return link and this packet correctly arrive relaying
BufferWith confirm that when having confirmed each packet, delay, the time delay of each packet that relatively receives selects the maximum packet of time delay to carry out dynamic dispatching.
In the semi-continuous scheduling process; Continuous dispatching is adopted in the transmission first of packet, need not relaying and sends the PDCCH signaling, but all need relaying at Transmission Time Interval (Transmission Time Interval for SPS activation, modification, release and SPS re-transmission; TTI) notify the transformat of terminal data bag dynamically through the PDCCH signaling; With the position of physical resource, and when notifying the terminal dynamically, adopt SPS to reserve the HARQ process and realize through the PDCCH signaling.For the ease of distinguishing with the conventional dynamic scheduling; The HARQ process that adopts non-SPS to reserve is in embodiments of the present invention dispatched this packet; Thereby in this PDCCH signaling, carry the identification information of the HARQ process of this non-SPS reservation of dispatching; So that the terminal can confirm that this scheduling is the conventional dynamic scheduling mode according to the HARQ process of this identification information, or the scheduling mode of this programme proposition.Concrete for the ease of subsequent descriptions, can the conventional dynamic scheduling mode be become dynamic mode 1, the dynamic dispatching mode of mentioning in this programme is called dynamic mode 2.
The detailed process of the semi-continuous scheduling of the relaying access link that Fig. 5 provides for the embodiment of the invention, this process may further comprise the steps:
S501: relaying receives the base station and sends packet on return link.
S502: according to the number of retransmissions of the packet that receives on return link, reach the RTT that preserves, confirm the propagation delay time on return link of this packet.
S503: whether the propagation delay time of judging this packet greater than the time delay threshold value of preserving, when judged result when being, carry out step S504, otherwise, carry out step S506.
S504: according to the propagation delay time of established data bag, and this packet correctly arrives the wait time delay in formation behind the relaying, the time delay of specified data bag, and the time delay of each packet that relatively receives is selected the maximum packet of time delay.
S505: the HARQ process that on the access subframe outside the predefine transmission time, adopts non-SPS to reserve is carried out dynamic dispatching to the packet of selecting, and this identification information that carries out the HARQ process of dynamic dispatching is carried in the PDCCH signaling sends to the terminal.
S506:, this packet is carried out continuous dispatching at the predefine transmission time.
When relaying adopts the access subframe of dynamic dispatching outside the predefine transmission time to adopt the HARQ process of non-SPS reservation that packet is carried out dynamic dispatching; Differentiating this packet for the ease of the terminal is to transmit first on access link; Still retransmit; In this PDCCH signaling, can also comprise new data indication (New Data Indicator, information NDI).Because under SPS conventional dynamic scheduling method, when this NDI is 0, identifying this packet is new data packets, when this NDI is 1, being designated packet is retransmission data packet may.Whether can overturn according to this NDI information in embodiments of the present invention, identifying this packet is through the packet of access link new transfer or the packet that retransmits.
Concrete, because this dynamic dispatching is reserved the realization of HARQ process through non-SPS in embodiments of the present invention, the NDI information initializing of the HARQ process that therefore in terminal and relaying, can reserve to the non-SPS of each identification information.When relaying adopts the HARQ process scheduling packet that the non-SPS of this identification information reserves; On access link, be first data packets for transmission according to this packet of dispatching; Still the packet that retransmits; The NDI information assignment of the HARQ process that the non-SPS of this identification information is reserved, and adopt the NDI information after the assignment that the NDI information of the HARQ process of this identification information of self preserving is upgraded.For example; In relaying, preserve the NDI information of the HARQ process that the non-SPS of a certain identification information reserves; When relaying adopted the HARQ process of the non-SPS reservation of this identification information on access link, to dispatch a certain packet first, relaying overturn to the NDI information of carrying in the PDCCH signaling according to the NDI information of the HARQ process of the non-SPS reservation of this identification information of self preserving; Be data packets for transmission first on access link to identify this data packets for transmission; When this packet on access link, when the HARQ process first that the non-SPS through this identification information reserves was not transferred to end side, the HARQ process that relaying need be reserved through the non-SPS of this identification information retransmitted this packet on access link; It is constant that this moment, relaying kept this NDI sign, and can think that this NDI does not overturn this moment.
Equally; When the terminal receives the packet of HARQ process dynamic dispatching of this identification information; Adopt the NDI information of the HARQ process of NDI information of carrying in the PDCCH signaling and this identification information of self preserving, judge whether this NDI information overturns, judge the NDI information of self preserving whether with this PDCCH signaling in the NDI information of carrying whether consistent; When unanimity, think upset, when inconsistent, think upset.After having confirmed whether this NDI information overturns, the NDI information updating of adopting that the NDI information of carrying in this PDCCH signaling preserves self to HARQ process that should identification information.
In SPS, pass through semi-continuous scheduling Radio Network Temporary Identifier (Semi-Persistent SchedulingCell Radio Network Temporary Identifier; SPS C-RNTI) sign PDCCH signaling; Therefore whether be dynamic dispatching for the ease of the terminal recognition scheduling mode; Whether need on the access subframe outside the predefine transmission time, adopt SPS C-RNTI sign PDCCH signaling, be dynamic dispatching so that this scheduling mode can be identified in the terminal.
Another detailed process of the semi-continuous scheduling of the relaying access link that Fig. 6 provides for the embodiment of the invention, this process may further comprise the steps:
S601: relaying receives the packet that send the base station on return link.
S602: according to the number of retransmissions of the packet that receives on return link, and the RTT that preserves, confirm the propagation delay time of this packet on return link.
S603: whether the propagation delay time of judging this packet greater than the time delay threshold value of preserving, when judged result when being, carry out step S604, otherwise, carry out step S606.
S604: according to the propagation delay time of established data bag; And this packet correctly arrives the wait time delay in formation behind the relaying, the time delay of specified data bag, and whether the time delay of the packet that relatively receives is the time delay maximum; When the time delay of this packet is maximum, carry out step S605.
S605: the HARQ process that on the access subframe outside the predefine transmission time, adopts non-SPS to reserve is dispatched this packet; Wherein this identification information that carries out the HARQ process of dynamic dispatching is carried in the PDCCH signaling, and this PDCCH signaling is through SPS C-RNTI sign.
S606: this packet is carried out continuous dispatching at the predefine transmission time.
In addition in embodiments of the present invention because when the fooled relaying of return link does not correctly receive the packet that sends the base station; Relaying can return nack message to the base station; This moment is at the predefine transmission time; The service queue of relaying is empty, and in order effectively to improve the utilance of resource, relaying can adopt this other user's data bags of service queue transmission.
When relaying through insert subframe with data packet dispatching after end side; Because it possibly be to adopt the continuous dispatching mode that the relay is dispatched to the packet at terminal; Also possibly be that dynamic dispatching mode in traditional SPS scheme is a dynamic mode 1, perhaps also possibly be that the dynamic dispatching mode in this programme is a dynamic mode 2.Therefore for its packet of terminal, adopt the different received mode to receive to different scheduling mode scheduling.
For the packet that adopts the continuous dispatching mode to dispatch at the predefine transmission time; When UE is in the SPS state of activation; (Transmission Time Interval does not monitor descending scheduling in TTI), and current TTI is when being in the predefine transmission time in current transmission time interval; Then the terminal adopts the predefine transformat to carry out the reception of packet on pre-allocation resource, need not decipher the PDCCH signaling.
When the terminal monitors the PDCCH signaling that adopts the SPS-CRNI sign in current TTI; Then decipher this PDCCH signaling; When the identification information of the HARQ process of carrying in this signaling is the identification information of the HARQ process reserved of SPS, confirm that then this dynamic dispatching mode is that dynamic dispatching mode under traditional SPS scheme is a dynamic mode 1, discerns whether the NDI that carries in this access subframe is 0; When this NDI is 0; And confirm that self is current when not being in the SPS state of activation, then self carries out the SPS activation manipulation, when this NDI is 0; Himself is current when being in state of activation, then according to the predefined transformat and the pre-allocation resource that carry in the PDCCH signaling SPS is made amendment; When this NDI is 1, confirm that the HARQ process of this identification information is used for retransmission operation, this packet that is scheduled is retransmitted merging.
When the HARQ process of carrying in this signaling is the HARQ process of non-SPS reservation; Then this dynamic dispatching mode is that the dynamic dispatching mode in this programme is a dynamic mode 2; Because this packet need be known and be data packets for transmission first on access link that the packet that still retransmits is therefore according to the 2nd NDI information of carrying in this PDCCH signaling in the terminal; And the 3rd corresponding NDI information of HARQ process to should non-SPS reserving of self preserving; Judge whether the 2nd NDI that carries in this PDCCH signaling overturns, when definite the 2nd NDI overturns, confirm that then this packet is transmission first on access link; This packet is stored in the corresponding harq buffer district; And the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves, when definite the 2nd NDI does not overturn, confirm that this packet is a retransfer scheduling on access link; This packet is retransmitted merging with packet in the corresponding harq buffer district, and the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves.
The receiving course that Fig. 7 provides for the embodiment of the invention based on the dispatching method terminal of above-mentioned access link, this process may further comprise the steps:
S701: the PDCCH signaling that whether exists in this access subframe to self is monitored in each descending access subframe constantly in the terminal, and wherein this PDCCH signaling is through SPS C-RNTI sign.When monitoring when existing, carry out step S702, when monitoring when not existing, carry out step S708.
S702: the identification information of discerning the HARQ process of carrying in this PDCCH signaling.
S703: whether according to this HARQ of this identification information judgment is the HARQ process that non-SPS reserves, when judged result when being, carry out step S704, otherwise, carry out step S707.
S704: the 3rd NDI information to the HARQ process should non-SPS reserved of preserving, and the 2nd NDI information of carrying in this PDCCH signaling according to self, judge whether the 2nd NDI overturns; When definite the 2nd NDI overturns; Carry out step S705, otherwise, carry out step S706.
S705: confirm the transmission first on access link of this packet, this packet is stored in the corresponding harq buffer district, and the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves.
S706: confirm that this packet is retransfer scheduling on access link; This packet is retransmitted merging with packet in the corresponding harq buffer district, and the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves.
S707: adopt the reception programme under the dynamic dispatching to receive this packet, concrete, discern the NDI information of carrying in this PDCCH signaling;
When this NDI is 0, and terminal self is current when being in the SPS state of activation, according to the predefine transformat and the pre-allocation resource that carry in the PDCCH signaling SPS is made amendment;
When this NDI is 0, and when being in the SPS unactivated state before the terminal self,, carrying out SPS and activate according to carrying descending SPS pre-allocation resource and predefine transformat in the PDCCH signaling;
When this NDI is 1, confirm that the HARQ process of this identification information is used for retransmission operation, this packet that is scheduled is retransmitted merging.
S708: judge whether current time is in SPS predefine transmission time, when definite current time is SPS predefine transmission time, carries out SPS predefine and receive, otherwise receiving course finishes.
The method for semi-persistently dispatching of the relaying access link that the embodiment of the invention provides adopts the Computer Simulation mode to verify.Concrete simulation process comprises: adopt system-level emulation mode, a plurality of community cellular networks are carried out modeling, network is made up of 19 cellular cells, and each sub-district is divided into 3 sectors, and a relaying is all disposed in each sector.The deployed position sketch map of relaying and base station is as shown in Figure 8, and it is the center of circle that relaying is positioned at the center, sector, and 1/5ISD is near a side of cell edge on the circular arc of radius.Each sector has 20 users, and being randomly dispersed in the relaying is the center, in the circle of 30m radius, and all inserts relaying.The frame structure configuration of system is as shown in table 1 below, and table 2 is the system emulation parameter configuration.
Table 1
Table 2
In order to compare analysis; Adopt traditional SPS scheme also to carry out emulation on relaying; When Fig. 9 adopts the SPS dispatching method of transmission and relaying access link SPS dispatching method that this programme proposes that packet is dispatched on access link respectively for the relay; Double bounce user's VoIP packet time delay cumulative distribution function (Cumulative Distribution Function; CDF) curve contrast, wherein solid line is the CDF curve of the method for semi-persistently dispatching that adopts this programme and provide, dotted line is for adopting the CDF curve of traditional SPS dispatching method.In this CDF curve, transverse axis is the time delay of VoIP packet, adopts millisecond (ms) metering, and the longitudinal axis is a probable value.The VoIP packet time delay here arrives the relay service queue from packet and begins statistics; Be included in the terminal traffic formation and wait for that scheduling, return link retransmit the time experienced and the processing delay of relay; Wait time delay in the service queue of relay is till the terminal correctly receives or is abandoned.
Know that according to shown in Figure 9 two kinds of double bounce user minimum transfer time delays under the scheduling scheme are 6ms; Here by due to the minimum interval between passback subframe and the next access subframe; And at 50%CDF curve place; Be compared to traditional SPS scheme, the method for semi-persistently dispatching of the relaying access link that the employing embodiment of the invention provides can reduce the transmission delay of about 20ms for the double bounce user.This is because when adopting traditional SPS scheme in the relay; The problem that exists the VoIP service queue to overstock; And the scheduling scheme that adopts the embodiment of the invention to provide; The packet that overstocks to the VoIP service queue has adopted dynamic dispatching method, has therefore obviously reduced the time delay of double bounce user VoIP packet.
The structural representation of the semi-continuous scheduling system of the relaying access link that Figure 10 provides for the embodiment of the invention, this system comprises:
Relaying 102; Be used for receiving the packet that send the base station through return link; According to the number of retransmissions of the packet that receives on return link; And the return link of preserving mixes the round-trip delay of automatic repeat requests HARQ, confirms the propagation delay time of this packet on return link, when the propagation delay time of this packet during greater than the time delay threshold value of preserving; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling;
Said relaying 102 also is used for; According to first new data indication NDI information to the HARQ process should non-SPS reserved of preserving; And whether this packet transmits at access link first; Confirm the 2nd NDI information of the HARQ process of should non-SPS reserving is carried at said the 2nd NDI information in the physical downlink control channel PDCCH signaling, and the NDI information to HARQ process that should non-SPS reservation that adopts that this 2nd NDI information updating self of confirming preserves.
Said relaying 102 also is used for, and according to the SPS that adopts, confirms the SPS Radio Network Temporary Identifier C-RNTI of this SPS of sign, this SPS C-RNTI that confirms is inserted at this send this PDCCH signaling of sign on subframe.
Said terminal 103 specifically is used for; Inserting the PDCCH signaling that receives on the subframe to the SPS C-RNTI sign of self; Whether the identification information of judging the HARQ process of carrying in this PDCCH signaling is the identification information of the HARQ process of non-SPS reservation; When judged result when being, adopt dynamic dispatching this packet of reception programme reception down.
Said terminal 103 specifically is used for, and when the identification information of the HARQ process of carrying in the said PDCCH signaling is the identification information of the HARQ process reserved of SPS, discerns the NDI information of carrying in this PDCCH signaling; When this NDI is 0; And terminal self is current when being in the SPS state of activation, according to the predefine transformat and the pre-allocation resource that carry in the PDCCH signaling SPS is made amendment, when this NDI is 0; And when being in the SPS unactivated state before the terminal self; According to carrying descending SPS pre-allocation resource and predefine transformat in the PDCCH signaling, carry out SPS and activate, when this NDI is 1; The HARQ process of confirming this identification information is used for retransmission operation, and this packet that is scheduled is retransmitted merging.
Said terminal 103 specifically is used for; The identification information of the HARQ process of reserving according to the non-SPS that carries in the said PDCCH signaling is discerned the 3rd NDI information to HARQ process that should identification information of self preserving, according to said the 3rd NDI information; And the 2nd NDI information of carrying in this PDCCH signaling; Confirm whether said the 2nd NDI overturns, when said NDI overturns, confirm the transmission first on access link of this packet; This packet is stored in the corresponding harq buffer district; And the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves, when said the 2nd NDI does not overturn, confirm that this packet is retransfer scheduling on access link; This packet is retransmitted merging with packet in the corresponding harq buffer district, and the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves.
The structural representation of the semi-continuous scheduling device of the relaying access link that Figure 11 provides for the embodiment of the invention, this device comprises:
Monitoring modular 112; Be used for according to the number of retransmissions of packet on return link that receives; And the return link of preserving mixes the round-trip delay of automatic repeat requests HARQ; Confirm the propagation delay time of this packet on return link, the propagation delay time of judging this packet is during greater than the transmission threshold value of preserving, and the notice sending module carries out dynamic dispatching;
Sending module 113; Be used for notice according to the monitoring modular that receives; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling.
Said device also comprises:
Said device also comprises:
Said device also comprises:
Said monitoring modular 112 specifically is used for; Preserve the first time delay threshold value; When packet when transmission back is correctly received by relaying first on return link; Confirm correctly to be arrived the moment of relaying, and the moment of this packet of relaying predefine transmission is poor, adopts the difference renewal in this moment and preserve the said first time delay threshold value by the correct packet that receives.
Method for semi-persistently dispatching, system and the device of a kind of relaying access link of the embodiment of the invention; In this method when relaying receives the packet that sends the base station through return link after; According to the number of retransmissions of this packet on return link; And the RTT that preserves confirms the propagation delay time of this packet at return link, when the propagation delay time of this packet during greater than the time delay threshold value of preserving, and this packet of HARQ process scheduling that the access subframe outside the predefine transmission time adopts non-SPS to reserve.Because in embodiments of the present invention to the bigger packet of time delay that exists; Can constantly this packet not carried out continuous dispatching in predefine; And directly adopt the method for dynamic dispatching this packet to be dispatched in the access subframe of predefine outside the moment; Thereby can effectively reduce the propagation delay time of this packet, improve performance of services.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (19)
1. the method for semi-persistently dispatching of a relaying access link is characterized in that, comprising:
Relaying receives the packet that send the base station on return link;
According to the number of retransmissions of the packet that receives on return link, reach the round-trip delay that the return link of preserving mixes automatic repeat requests HARQ, confirm the propagation delay time of this packet on return link;
When the propagation delay time of this packet during greater than the time delay threshold value of preserving; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling.
2. the method for claim 1 is characterized in that, said before employing PDCCH signaling is carried out dynamic dispatching to this packet on the access subframe outside the predefine transmission time, said method also comprises:
According to the propagation delay time of established data bag, and this packet correctly arrives the wait time delay in formation behind the relaying, confirms the time delay of this packet;
The time delay of the packet that relatively receives confirms that the time delay of this packet is maximum.
3. the method for claim 1 is characterized in that, said before employing PDCCH signaling is carried out dynamic dispatching to this packet on the access subframe outside the predefine transmission time, said method also comprises:
According to first new data indication NDI information to the HARQ process should non-SPS reserved of preserving, and whether first this packet in access link transmission, confirms the 2nd NDI information to the HARQ process of should non-SPS reserving;
Said the 2nd NDI information is carried in the physical downlink control channel PDCCH signaling, and the NDI information to the HARQ process should non-SPS reserved that adopts that this 2nd NDI information updating self of confirming preserves.
4. like claim 1 or 3 described methods, it is characterized in that said before employing PDCCH signaling is carried out dynamic dispatching to this packet on the access subframe outside the predefine transmission time, said method also comprises:
According to the SPS that adopts, confirm the SPS Radio Network Temporary Identifier C-RNTI of this SPS of sign;
This SPS C-RNTI that confirms is sent on this access subframe, to identify this PDCCH signaling.
5. method as claimed in claim 4 is characterized in that, said method also comprises:
The PDCCH signaling that receives on the subframe to the SPS C-RNTI sign of self is being inserted at the terminal;
Whether the identification information of judging the HARQ process of carrying in this PDCCH signaling is the identification information of the HARQ process of non-SPS reservation;
When judged result when being, adopt dynamic dispatching this packet of reception programme reception down.
6. method as claimed in claim 5 is characterized in that, said method also comprises:
When the identification information of the HARQ process of carrying in the said PDCCH signaling is the identification information of the HARQ process reserved of SPS, discern the NDI information of carrying in this PDCCH signaling;
When this NDI is 0, and terminal self is current when being in the SPS state of activation, according to the predefine transformat and the pre-allocation resource that carry in the PDCCH signaling SPS is made amendment;
When this NDI is 0, and when being in the SPS unactivated state before the terminal self,, carrying out SPS and activate according to carrying descending SPS pre-allocation resource and predefine transformat in the PDCCH signaling;
When this NDI is 1, confirm that the HARQ process of this identification information is used for retransmission operation, this packet that is scheduled is retransmitted merging.
7. method as claimed in claim 5 is characterized in that, the reception programme under the said employing dynamic dispatching receives this packet and comprises:
The identification information of the HARQ process of reserving according to the non-SPS that carries in the said PDCCH signaling is discerned the 3rd NDI information to HARQ process that should identification information of self preserving;
According to said the 3rd NDI information, and the 2nd NDI information of carrying in this PDCCH signaling, confirm whether said the 2nd NDI overturns;
When said the 2nd NDI overturns; Confirm the transmission first on access link of this packet; This packet is stored in the corresponding harq buffer district, and the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves;
When said the 2nd NDI does not overturn; Confirm that this packet is retransfer scheduling on access link; This packet is retransmitted merging with packet in the corresponding harq buffer district, and the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves.
8. the method for claim 1 is characterized in that, preserves said time delay threshold value and comprises:
Preserve the first time delay threshold value; When packet when transmission back is correctly received by relaying first on return link; Confirm correctly to be arrived the moment of relaying by correct this packet that receives; And the moment of this packet of relaying predefine transmission is poor, adopts the difference renewal in this moment and preserves the said first time delay threshold value.
9. the semi-continuous scheduling system of a relaying access link is characterized in that, said system comprises:
The base station is used for sending packet through return link to relaying;
Relaying; Be used for receiving the packet that send the base station through return link; According to the number of retransmissions of the packet that receives on return link; And the return link of preserving mixes the round-trip delay of automatic repeat requests HARQ, confirms the propagation delay time of this packet on return link, when the propagation delay time of this packet during greater than the time delay threshold value of preserving; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling;
The terminal is used to receive the packet of dispatching on this access subframe.
10. system as claimed in claim 9; It is characterized in that; Said relaying also is used for; According to first new data indication NDI information to the HARQ process should non-SPS reserved of preserving, and whether first this packet in access link transmission, confirms the 2nd NDI information to the HARQ process of should non-SPS reserving; Said the 2nd NDI information is carried in the physical downlink control channel PDCCH signaling, and the NDI information to the HARQ process should non-SPS reserved that adopts that this 2nd NDI information updating self of confirming preserves.
11. like claim 9 or 10 described systems; It is characterized in that said relaying also is used for, according to the SPS that adopts; Confirm the SPS Radio Network Temporary Identifier C-RNTI of this SPS of sign, this SPS C-RNTI that confirms is inserted at this send this PDCCH signaling of sign on subframe.
12. system as claimed in claim 11; It is characterized in that; Said terminal specifically is used for, and is inserting the PDCCH signaling that receives on the subframe to the SPS C-RNTI sign of self, judges whether the identification information of the HARQ process of carrying in this PDCCH signaling is the identification information of the HARQ process of non-SPS reservation; When judged result when being, adopt dynamic dispatching this packet of reception programme reception down.
13. system as claimed in claim 12 is characterized in that, said terminal specifically is used for; When the identification information of the HARQ process of carrying in the said PDCCH signaling is the identification information of the HARQ process reserved of SPS, discern the NDI information of carrying in this PDCCH signaling, when this NDI is 0; And terminal self is current when being in the SPS state of activation, according to the predefine transformat and the pre-allocation resource that carry in the PDCCH signaling SPS is made amendment, when this NDI is 0; And terminal self is current when being in the SPS unactivated state; According to carrying descending SPS pre-allocation resource and predefine transformat in the PDCCH signaling, carry out SPS and activate, when this NDI is 1; The HARQ process of confirming this identification information is used for retransmission operation, and this packet that is scheduled is retransmitted merging.
14. system as claimed in claim 10 is characterized in that, said terminal specifically is used for; The identification information of the HARQ process of reserving according to the non-SPS that carries in the said PDCCH signaling is discerned the 3rd NDI information to HARQ process that should identification information of self preserving, according to said the 3rd NDI information; And the 2nd NDI information of carrying in this PDCCH signaling; Confirm whether said the 2nd NDI overturns, when said NDI overturns, confirm the transmission first on access link of this packet; This packet is stored in the corresponding harq buffer district; And the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves, when said the 2nd NDI does not overturn, confirm that this packet is retransfer scheduling on access link; This packet is retransmitted merging with packet in the corresponding harq buffer district, and the 3rd NDI information to HARQ process that should identification information that adopts that the 2nd NDI information updating self preserves.
15. the semi-continuous scheduling device in the relaying access link is characterized in that said device comprises:
Receiver module is used for receiving packet through return link:
Monitoring modular; Be used for according to the number of retransmissions of packet on return link that receives; And the return link of preserving mixes the round-trip delay of automatic repeat requests HARQ; Confirm the propagation delay time of this packet on return link, the propagation delay time of judging this packet is during greater than the transmission threshold value of preserving, and the notice sending module carries out dynamic dispatching;
Sending module; Be used for notice according to the monitoring modular that receives; On the access subframe outside the predefine transmission time, adopt physical downlink control channel PDCCH signaling that this packet is carried out dynamic dispatching, wherein carry the identification information of the HARQ process of the non-semi-continuous scheduling SPS reservation of dispatching in this PDCCH signaling.
16. device as claimed in claim 15 is characterized in that, said device also comprises:
Comparison module is used for the propagation delay time according to the established data bag, and this packet correctly arrives the wait time delay in formation behind the relaying, the time delay of specified data bag, and the time delay of the packet that relatively receives confirms that the time delay of this packet is maximum.
17. device as claimed in claim 15 is characterized in that, said device also comprises:
First determination module; Be used for according to first new data indication NDI information to the HARQ process should non-SPS reserved of preserving; And whether this packet transmits at access link first; Confirm the 2nd NDI information of the HARQ process of should non-SPS reserving is carried at said the 2nd NDI information in the physical downlink control channel PDCCH signaling, and the NDI information to HARQ process that should non-SPS reservation that adopts that this 2nd NDI information updating self of confirming preserves.
18., it is characterized in that said device also comprises like claim 15 or 17 described devices:
Second determination module is used for confirming the SPS Radio Network Temporary Identifier C-RNTI of this SPS of sign according to the SPS that adopts, and this SPS C-RNTI that confirms is inserted at this send this PDCCH signaling of sign on subframe.
19. device as claimed in claim 15; It is characterized in that said monitoring modular specifically is used for, preserve the first time delay threshold value; When packet when transmission back is correctly received by relaying first on return link; Confirm correctly to be arrived the moment of relaying, and the moment of this packet of relaying predefine transmission is poor, adopts the difference renewal in this moment and preserve the said first time delay threshold value by the correct packet that receives.
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