CN103442397A - LTE-A relay system and collaboration switching method of LTE-A relay system based on auxiliary carrier - Google Patents
LTE-A relay system and collaboration switching method of LTE-A relay system based on auxiliary carrier Download PDFInfo
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Abstract
The invention provides an LTE-A relay system and a collaboration switching method of the LTE-A relay system based on an auxiliary carrier. Services are provided for a user by a base station and the user at the same time through a direct-connection low frequency link of the base station-the user and a high-frequency link among the base station-a relay station-the user. The switching method comprises the steps that when the high-frequency link is required to be switched, a source side base station firstly detects the low-frequency direct-connection chink directly connected with the user, and therefore when the high-frequency link is switched, the services can be continuously provided for the user. According to the method, the requirement of the user for a large broadband is met, meanwhile, the outage probability of switching is reduced, and the quality of the user services is improved.
Description
Technical field
The present invention relates to communication technical field, be specifically related to the cooperation changing method of a kind of LTE-Advanced relay system based on subcarrier.
Background technology
Further evolution (Long Term Evolution-Advanced at long evolving system, LTE-Advanced, abbreviation LTE-A) in process, on the one hand, the LTE-Advanced system has proposed very high power system capacity requirement, on the other hand, can only obtain at high band for the large bandwidth spectrum that obtains capacity like this, and the path loss of high band and penetration loss may be all larger, be difficult to the covering obtained.Relaying (Relay) technology, as the key technology in the LTE-Advanced system, has the expansion cell coverage area, improves the advantage of throughput of system.The Relay technology can, by inserting relay station (Relay Station, RS), be filled up and cover not enough covering cavity and shade dead angle of causing effectively; Simultaneously, for the RS inserted, can obtain the cell splitting gain, thereby reach the purpose that improves power system capacity.
Switching is an important radio resource management function, is function and key feature exclusive in cellular system.Switching can be thought one of the most complicated in cellular communication and most important process.Switching belongs to the part of mobile management.In mobile communication system, for the travelling carriage of communicating by letter, when it moves to the overlay area of another base station from the overlay area of a base station, in order to guarantee the continuity of communication, the network control meeting starts handoff procedure, to guarantee the continuous transmission of customer service.So-called switching just refers to during mobile communications, and because position changes, and the communication link between handle and network is transferred to target BS from Current Serving BTS dynamically.The transfer that will guarantee communication link in handoff procedure can not affect normally carrying out of conversation, realizes taking over seamlessly.Good switchover policy must guarantee the mobility of user under continuity that the user serves and connection status.
Along with the development of wireless communication technology, traditional main flow handoff techniques such as direct-cut operation, soft handover and baton handover have successively appearred.Direct-cut operation mechanism has the switching realized between different frequency range and between different system, thereby can better realize that region covers and seamless switching, and the advantage of the compatibility of realization and existing 3GPP and non-3GPP and being used in the LTE-Advanced system.
Along with the development of broadband wireless communication technique, two-forty, large bandwidth will certainly become the trend of system of broadband wireless communication development.Based on this trend, carrier aggregation (Carrier Aggregation, CA) technology is suggested, and it can condense together a plurality of little bandwidth, thereby reaches the purpose of spread bandwidth.
In the LTE-Advanced system, after relaying technique and carrier aggregation technology are introduced into, the covering of system and the problem of large bandwidth have substantially been solved.Yet, for Cell Edge User, when user's reception pilot frequency intensity constantly descends, so that while needing to trigger switching, its handoff time delay increases relatively, switching is failure easily.Service quality while therefore, how to guarantee to switch and the handoff time delay that reduces become the important topic of research switchover policy.Under handoff scenario in the LTE-Advanced relay system, the introducing of the technology such as relaying technique and carrier aggregation, have higher requirement and challenge to the handover mechanism of system.
Summary of the invention
The object of the present invention is to provide a kind of LTE-A relay system and the cooperation changing method based on subcarrier thereof, solved in prior art for Cell Edge User when switching, switching is failed problem easily, can improve switching user's service quality.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of LTE-A relay system, comprise at least one relay station in macro base station and described macro base station coverage, the communication link of described relay system comprises back haul link between the direct link between described macro base station and user, described macro base station and described relay station and the access link between described relay station and described user; Described macro base station directly provides the low frequency carrier signal channel to described user, described macro base station provides the high frequency carrier channel to described relay station simultaneously, and control described relay station and provide the high frequency carrier channel to described user, described user receives the information that described macro base station and described relay station are sent simultaneously, and described user has the carrier aggregation function; Described macro base station provides data, services by direct link to described user, and provides continual data, services described user the handoff procedure of the relay station from described relay station to neighbor cell.
After the handover request information that described macro base station reception user sends, the user is switched to the relay station of neighbor cell; Macro base station activates with flyback and lives and control the low frequency carrier signal channel; Described relay station provides the high frequency carrier channel to the user, and carries out data interaction with the user.
Data interaction between the foundation of the control channel between described macro base station and relay station and macro base station and relay station completes by back haul link; Foundation and the data interaction of the control channel between described relay station and user complete by access link.
The cooperation changing method based on subcarrier of above-mentioned LTE-A relay system comprises the following steps:
S1) relay station of user couple and current service and the high frequency carrier channel between macro base station and low frequency carrier signal channel are measured, and measurement report are sent to the macro base station of current service;
S2) after the macro base station of current service receives measurement report, combining wireless resource management information determines whether needs to initiate switching, initiate switching if need, the macro base station of current service judges whether the low frequency carrier signal channel meets the condition that the user provides data, services that is continuously again, if do not meet, the macro base station of current service reselects the low frequency carrier signal channel in all residue candidate low frequency carrier signal channels, and the low frequency carrier signal channel reselected is replaced to original low frequency carrier signal channel; If meet, go to step S3);
S3) judge in each adjacent macro base station and (each adjacent macro base station) coverage thereof, in each relay station, whether accessible targeted sites is arranged, if do not have, high frequency carrier channel handoff failure; Otherwise, select best access target relay station, and corresponding macro base station sends the switching indication to the best access target relay station, macro base station corresponding to best access target relay station is the corresponding low frequency carrier signal channel of described user assignment, control best access target relay station is the corresponding high frequency carrier channel of described user assignment simultaneously, and the low frequency carrier signal channel of this distribution and high frequency carrier channel information are sent to the macro base station of current service by switching request acknowledgement message;
S4) through step S3) after, described user is synchronized on the high frequency carrier channel of best access target relay station for its distribution, and now the low frequency carrier signal channel between the macro base station of current service and described user is continuously described user data, services is provided;
S5) after described user completes with the best high frequency carrier channel synchronization that accesses the target relay station distribution, the macro base station that the macro base station of current service is corresponding with best access target relay station is carried out respectively low frequency carrier signal channel flyback and is lived and activation mechanism, simultaneously, the reposition that macro base station corresponding to best access target relay station informed the described user of gateway, so that the downlink path of gateway handoff user data, and all packets of receiving are mail to macro base station corresponding to best access target relay station;
S6) through step S5) after, discharging the relay station of the macro base station of described current service, described current service and the resource between described user, switching completes.
Step S1), in, described measurement report comprises the Reference Signal Received Quality value that the indication of carrier receiver signal strength, Reference Signal Received Power and user calculate in conjunction with carrier receiver signal strength indication and Reference Signal Received Power.
Step S2) in, described combining wireless resource management information determines whether needs the decision condition of initiating switching to be: judge whether the Reference Signal Received Quality of the high frequency carrier channel of described reporting of user meets the minimum requirements of customer service service quality, if do not meet, need to initiate switching.
Step S2), in, described low frequency carrier signal channel meets and to be continuously the user and to provide the condition of data, services to be: the Reference Signal Received Quality of the low frequency carrier signal channel of described reporting of user meets the minimum requirements of the service quality of customer service.
Step S3) in, describedly judge in each adjacent macro base station and coverage thereof whether have the method for accessible targeted sites to be in each relay station: judge in each relay station in described adjacent macro base station and coverage thereof whether have the website that meets the QoS of customer resource requirement, resource requirement comprises back haul link resource between direct link resource, macro base station and the relay station between macro base station and user and the access link resource between relay station and user; If each relay in adjacent macro base station and coverage thereof can not meet the requirement of QoS of customer resource requirement, there is no accessible targeted sites.
Step S3), in, best access target relay station point is the accessible relay of pilot signal strength maximum.
Step S5) in, the macro base station that the macro base station of described current service is corresponding with best access target relay station is carried out respectively the work of low frequency carrier signal channel flyback and is referred to that with activation mechanism the macro base station of current service stops sending data message with the low frequency carrier signal channel to described user, macro base station corresponding to best access target relay station is enabled as the low frequency carrier signal channel of described user assignment, and is continuously described user and sends data message.
Beneficial effect of the present invention is embodied in:
The cooperation changing method of LTE-A relay system of the present invention based on subcarrier, take full advantage of relaying technique and can guarantee system ovelay range, improve the advantage of throughput of system, and in conjunction with carrier aggregation technology, met the demand of system to bandwidth, the recycling quenching frequency, make edge customer when being switched, reduce the handoff probability, improved throughput of system, promoted user's service quality.
The accompanying drawing explanation
Fig. 1 is discontinuous carrier polymerization schematic diagram in existing different frequency bands;
Fig. 2 is LTE-A relay system chain of command and data surface chain graph in the embodiment of the present invention;
Fig. 3 is the control plane signaling process figure that in the embodiment of the present invention, terminal is switched in minizone;
The simulation comparison figure that Fig. 4 is system handoff probability;
The simulation comparison figure that Fig. 5 is throughput of system.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
A kind of LTE-A relay system, comprise at least one relay station in macro base station and coverage thereof, its communication link comprises back haul link between direct link, macro base station and the relay station between macro base station and user and the access link between relay station and user, described macro base station is for directly providing the low frequency carrier signal channel to the user, and provide the high frequency carrier channel to described relay station, control described relay station simultaneously and provide the high frequency carrier channel to described user; Receive the handover request information that described user sends, described user is switched to adjacent relay station; The low frequency carrier signal channel is activated with flyback and lives and control.
Described relay station is used for providing the high frequency carrier channel to described user, and carries out data interaction with described user.
Described user has and receives the ability that described macro base station and described relay station are sent information simultaneously, and described user has the carrier aggregation function.
Direct link between described macro base station and user provides data, services to described user for described macro base station, and the user from described relay station to the neighboring relay stations handoff procedure, continual data, services is provided.
Back haul link between described macro base station and relay station is for the foundation of the control channel between described macro base station and described relay station and the data interaction between described macro base station and described relay station.
Access link between described relay station and user is for foundation and the data interaction of the control channel between described relay station and described user.
A kind of user, in the method for minizone switching, comprising:
S1, described user is measured the relay station (being designated as the source relay station) that is attached thereto and high frequency carrier channel and the low frequency carrier signal channel between macro base station (being designated as the source macro base station), and measurement report is sent to described macro base station.
S2, after described macro base station receives the measurement report of high and low frequency carrier channel, combining wireless resource management (RRM) information adjudicates whether initiate switching: at first described macro base station (eNB) can judge the high frequency carrier channel, if the high frequency carrier channel meets the demand of communication, do not initiate switching, otherwise, judge whether the low frequency carrier signal signal meets the condition that user (UE) provides data, services that is continuously, if do not meet, go to step S3; If meet go to step S4.
S3, when high frequency carrier is continuously described user data, services is provided, described macro base station will be continuously described user and provide the low frequency carrier signal channel of data, services condition to reselect the low frequency carrier signal channel in all residue candidate low frequency carrier signal channels for not meeting, and this channel is replaced to original low frequency carrier signal channel.
S4, judge in each adjacent macro base station point and coverage thereof, in each relay, whether accessible targeted sites is arranged, if do not have, and high frequency carrier channel handoff failure; Otherwise, select best access target relay station, and corresponding macro base station (target macro base station) sends the switching indication to target relay station.The target macro base station is the corresponding low frequency carrier signal channel of described user assignment, control target relay station is the corresponding high frequency carrier channel of described user assignment simultaneously, and this low frequency carrier signal channel and high frequency carrier channel information are sent to the source macro base station by switching request acknowledgement message.
S5, described user is synchronized on the high frequency carrier channel that target relay station is its distribution, and now the low frequency carrier signal channel between source macro base station and described user is continuously described user data, services is provided.
S6, after the high frequency carrier channel synchronization that described user and target relay station are its distribution completes, described source macro base station and target macro base station are carried out respectively low frequency carrier signal channel flyback and are lived and activation mechanism, simultaneously, the described user's of gateway MME reposition can be told in the target macro base station, so that the downlink path of gateway handoff user data, and all packets of receiving can be mail to the target macro base station.
The method that macro base station is activated the low frequency carrier signal channel or flyback is lived and controlled comprises:
The reception signal reference power (RSRP) of measuring on the low frequency down channel as the user is higher than 10% thresholding, and keep certain triggered time (TTT), described user is to macro base station report A1 event, the low frequency down channel can be set to state of activation, if now at buffering area, have data to need transmission, the low frequency down channel is activated.
The reception signal reference power (RSRP) of measuring on the low frequency down channel as the user is lower than 5% thresholding, and keeps certain departure time (TTT), and the user is to macro base station report A2 event, and now the low frequency down channel can be set to the flyback state of living.
S7, carry out all the other processes of switching, the resource between source of release macro base station, source relay station and described user, and switching completes.
Preferably, in step S1, described measurement report specifically refers to the measurement report of high frequency carrier channel and low frequency carrier signal channel, mainly comprise the indication of carrier receiver signal strength (Carrier RSSI) and Reference Signal Received Power (RSRP), and Reference Signal Received Quality (RSRQ) value calculated in conjunction with above two indexs process by described user.
Preferably, in step S2, if the Reference Signal Received Quality (RSRQ) of the high frequency carrier channel of described reporting of user meets the minimum requirements of customer service service quality (QoS), the high frequency carrier channel meets the demand of communication, otherwise the high frequency carrier channel does not meet the demand of communication.
Preferably, in step S2, described low frequency carrier signal channel meets the condition that continues transmission data-signal (be continuously the user data, services is provided) and is specially: the Reference Signal Received Quality (RSRQ) of the low frequency carrier signal channel of described reporting of user meets the minimum requirements of the service quality (QoS) of customer service.
Preferably, in step S3, described all residue candidate low frequency carrier signal channels comprise available free low frequency carrier signal channel in whole low frequency carrier signal channels.
Preferably, in step S4, describedly judge in each adjacent macro base station point and coverage thereof whether have the determination methods of accessible targeted sites to be in each via node:
Each relay in described adjacent macro base station and coverage thereof can provide enough link circuit resource to meet the demand of described QoS of customer, and these link circuit resources comprise back haul link resource between direct link resource, macro base station and the relay station between macro base station and user and the access link resource between relay station and user.
Can select suitable channel according to the service condition of the dispatching algorithm of community, place and each channel in each relay in described adjacent macro base station and coverage thereof is described user's service.
If can not meet the requirement of QoS of customer or can not, for the suitable channel of described user assignment, refuse handover request in each relay in adjacent macro base station and coverage thereof.
Preferably, in step S4, best access target relay station point is the accessible relay of pilot signal strength maximum.
Preferably, in step S5, when described user is synchronized on the high frequency carrier channel that target relay station is its distribution, being continuously described user provides the low frequency carrier signal channel of data, services to remain the low frequency carrier signal channel between source macro base station and described user.
Preferably, in step S6, source macro base station and target macro base station are carried out respectively low frequency carrier signal channel flyback and are lived and to refer to that with activation mechanism the source macro base station stops continuing to send data message with the low frequency carrier signal channel to described user, and the low frequency carrier signal channel that the target macro base station is enabled as described user assignment is continuously described user and sends data message.
Consult Fig. 2, evolved Node B(Evolved Node B, eNB) between be interconnective by X2 interface, eNB and Mobility Management Entity (Mobility Management Entity, MME) between/Service Gateway (Serving GateWay, S-GW), be to connect by the S1 interface.ENB not only will set up control plane, also will set up user plane, and wherein the user plane of S1 interface terminates in S-GW, and the control plane of S1 interface terminates in MME.Simultaneously, eNB can communicate by two links and user, respectively: eNB-user and eNB-RN-user, wherein, this of eNB-user link is called direct connected link, and its carrier channel is the low frequency carrier signal channel, this link of eNB-RN is back haul link, carrier channel is the high frequency carrier channel, and this channel of RN-user is access link, and carrier channel is the high frequency carrier channel.RN represents via node.
It should be noted that, the S1 interface, for the transmission of various control signals and in switching, is supported the switching between eNB.X2 interface is for supporting the tunnel feature of mobility and user plane.
Simultaneously, the user, after the signal received from eNB and RN, will pass to user's low frequency carrier signal to eNB and high frequency carrier that RN passes to the user condenses together by carrier aggregation.Thereby the user who accepts carrier signal must have carrier aggregation capacity.
Because eNB need to be to the user assignment low frequency carrier signal, distribute high frequency carrier to RN again simultaneously, therefore, the eNB used is except the function with traditional eNB, the ability of managing simultaneously and distributing the two carrier waves of alien frequencies also must be arranged, thereby eNB used in the present invention has certain difference compared to traditional eNB.
Generally, the RN in the eNB coverage is placed on 2/3 place of eNB coverage, and simultaneously, RN need to be to the user assignment high frequency carrier, thereby RN used has certain resource management function.
In a word, the invention provides a kind of LTE-Advanced relay system, this system has comprised at least one RN in eNB and coverage thereof, and in actual applications, the deployment number of RN can be 2,4,10 etc., and this depends on the multiple factors such as the density of population in actual environment usually.ENB not only will set up and service data face and chain of command with MME/S-GW, and the while also will be safeguarded the network topology structure of self, need with self coverage in RN carry out data interaction, also will and adjacent eNB between carry out data interaction.
Consult Fig. 3, handoff procedure comprises handover measurement, switch decision and switching execution.Concrete handoff procedure is as described below:
Before handoff procedure is initiated, between source eNB and user, by source eNB-user's low frequency direct connected link and eNB-source, source RN-user's high frequency link, provide service for the user simultaneously.Wherein, the link between the RN of eNB-source, source is back haul link, and the link between the RN-user of source is access link.
Source eNB carrys out the measuring process of configure user according to the roaming restricted information obtained from MME/S-GW, and sends measurement report according to predetermined rule.Wherein, measuring process comprises the measurement of low frequency carrier signal and the measurement of high frequency carrier.
Whether source eNB decides the user to be switched according to measurement report and RRM (RRM) information.
At first, after source eNB receives the measurement report that the user sends, can first judge high frequency carrier, if high frequency carrier meets the demand of telex network, do not initiate switching, otherwise continue to judge whether low frequency carrier signal can meet the demand of telex network, if do not meet, in remaining low frequency carrier signal channel, reselect the low frequency carrier signal channel, and it is replaced to former low frequency carrier signal channel; Otherwise, initiate switching.
When source eNB determines that the user need to be switched, send handover request information to target eNB, comprising in target side, for switching, preparing the necessary information of resource, X2 signaling context reference message as the user in the eNB of source, the user is in grouping system (Evolved Packet System, the EPS) bearer context of S1 signaling context reference message, evolution and the sign of Target cell etc.
Target eNB can be received and control according to the QoS information and executing of the EPS carrying of receiving, if the resource that target eNB can be required to user assignment, target eNB configuration requested resource is also the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI that user assignment is new (C-RNTI), for the user, accesses the Xin community.
When carrying out the receiving process, target eNB will be not only user assignment low frequency carrier signal channel, and for target RN distributes the high frequency carrier channel, it is the necessary high frequency link circuit resource of user assignment that the while target eNB also will be controlled target RN.
Target eNB sends handover request ack message to source eNB, sends to user's switching command comprising needs, the newly assigned C-RNTI of target eNB and other possible parameters.
After source eNB receives the handover request ack message from target eNB, can generate a handover command messages, and this message is sent to the user by source RN, the user will be switched after receiving handover command messages.
The user leaves and is synchronized to the target RN target eNB control from source eNB.Simultaneously, RNHui Xiang source, source eNB state (SN Status) message that sends sequence number, the sequence state of transmission of informing source RN.Source eNB is according to this message, the grouping that judgement source RN does not send, and on the source that the is grouped in eNB will do not sent and the low frequency direct link between UE, continue to send, after target RN until divide into groups under transmission end or user and target eNB control connects, source eNB will trigger the low frequency carrier signal flyback and live machine-processed.
Source eNB is to the target eNB status message that sends sequence number, to transmit packet data convergence layer (the Packet Date Convergence Protocol of up link, PDCP) sequence number recipient and down link PDCPSN conveyer system evolved structure (System Architecture Evolution, SAE) state of carrying, target eNB can be carried out permutatation and duplicate detection to the sequence number received according to PDCP SN.
Target eNB receives cushioned and the grouping that transmitting from source eNB, and by these groupings of buffer memory.In this process, source eNB can utilize the low frequency carrier signal channel to be continuously user's data information.
After the user successfully has been linked into the target RN under target eNB control, the user sends the handoff procedure of switch acknowledgment message indicating user from source RN to target RN by target RN to target eNB and completes, and now between user and target RN, by the high frequency access link, is connected.Simultaneously, target eNB is carried out verification to the C-RNTI carried in message.And, from this step, target eNB can communicate by high frequency carrier channel and user.
Simultaneously, after the grouped data that the user is transmitted by the low frequency carrier signal channel reception sources eNB between source eNB and user, the packet-data states message that can send by this link transfer source of user-target RN-target eNB eNB, so that target eNB is deleted the grouped data that needn't transmit in its buffered packet data.
After if user and target RN establish and are connected, low frequency carrier signal channel between source eNB and user still has data message transmitting, the user sends end-tag (end marker) packet by the direct-connected carrier channel of low frequency be connected with source eNB to source eNB, and notification source eNB triggers flyback to the low frequency carrier signal channel and lives machine-processed.
Target eNB can be to MME transmit path handover request message, so that the downlink path of gateway handoff user data can mail to target eNB by all packets of receiving, simultaneity factor will trigger low frequency carrier signal channel activation mechanism in the target eNB side, for target eNB is set up the low frequency carrier signal channel to the direct link between the user.
After MME receives path handover request message, can send user plane update request message to S-GW, the connection of notice S-GW user plane has been switched to target eNB from source eNB.
User plane switching downlink path is to target side.S-GW discharges the user-plane resources of all corresponding source eNB.Afterwards, S-GW returns to user plane renewal response message to MME.
MME sends and confirms path handover acknowledge message to target eNB, to confirm path switching message.
Target eNB sends the user's context release message with the success of notification source eNB handoff procedure, and discharges the resource of originally occupying.
After source eNB receives the user's context release message, discharge and this user-dependent controlled in wireless plane resource, switching completes.
In different frequency bands, Fig. 1 is consulted in the discontinuous carrier polymerization, the discontinuous carrier polymerization is that two in different frequency bands and a plurality of subcarrier are aggregated into to the LTE-A carrier wave in different frequency bands, and the transmission bandwidth using the LTE-A carrier wave of polymerization as system, to meet the LTE-A system to two-forty, the demand of large bandwidth.In the present invention, component carrier 1 and component carrier 2 are respectively subcarrier and the interior subcarrier of high frequency band in low-frequency band, and the bandwidth of component carrier 1 and component carrier 2 is depending on the required bandwidth of LTE-A system.
Simulation results
The present invention carries out analog simulation by the system emulation parameter of setting in following form, mainly aspect community handoff probability and throughput of system, with traditional LTE-A relay system, is carrying out simulation comparison, and comparing result as shown in Figure 4 and Figure 5.
The system emulation parameter
Referring to Fig. 4, as can be seen from Figure 4, the changing method that the present invention proposes is compared the further handoff probability that reduced with the changing method of traditional LTE-A relay system.This is mainly because traditional LTE-A relay system adopts is the direct-cut operation strategy of " first have no progeny and connect ", and the user, when switching, is first broken and being connected of source relay station, then synchronizeed with target relay station; Simultaneously, because communication link has time variation, the possibility that this just will certainly cause switching in handoff procedure and interrupt; From figure, also can find out, the user is different from the distance of target relaying, and the handoff probability is also different, and the distance of user and target relay station is larger, and the handoff probability is larger.The changing method that the present invention proposes is compared with traditional LTE-A relay system, the handoff probability has further reduced, this be mainly because: added the direct link of a user to base station in traditional LTE-A relay system, and this direct link has been used the low frequency carrier signal channel, adopted the changing method of low frequency carrier signal auxiliary high frequency carrier wave switching in the process of switching, high frequency carrier is continuously the user at the process medium and low frequency carrier wave switched data, services is provided simultaneously.Low frequency carrier signal is due to frequency than Di，Qi road strength loss less, and coverage is relatively large, and when this just initiates switching for high frequency carrier, low frequency carrier signal is continuously user's service provides assurance.Therefore, in simulation result, the method that the present invention proposes can be lower than the method for traditional LTE-A relay system aspect the handoff probability.
Referring to Fig. 5, as can be seen from Figure 5 aspect throughput of system, the method that the present invention proposes is compared and is greatly improved with the method for traditional LTE-A relay system, this be mainly because: the method that this patent proposes has adopted two transmission links to the user, and has adopted carrier aggregation technology.The increase of transmission link, make the user can from system, obtain more information; The use of carrier aggregation technology, make the transmission bandwidth of system increase, and can transmit more information, promoted the transmission capacity of system.In addition, because the quantity of user in simulation process is respectively 10,15,20,25,30, and supposed that there are enough stock numbers community, therefore, the throughput of system can increase along with the increase of number of users.As seen from the above analysis, the present invention compares with traditional LTE-A relay system, and the throughput of system has promoted greatly.
In a word, provide service for the user by base station-user's direct-connected low frequency link and the high frequency link between base station-relay station-user between base station and user in system of the present invention simultaneously, when the high frequency link need to be switched, the source base station is first to being detected with the direct-connected low frequency direct connected link of user, to guarantee that can be continuously the user when the high frequency link is switched provides service, the method is when guaranteeing that the user is to large bandwidth demand, reduced the handoff probability, promote throughput of system, improved QoS of customer.
Claims (10)
1. a LTE-A relay system, it is characterized in that: comprise at least one relay station in macro base station and described macro base station coverage, the communication link of described relay system comprises back haul link between the direct link between described macro base station and user, described macro base station and described relay station and the access link between described relay station and described user; Described macro base station directly provides the low frequency carrier signal channel to described user, described macro base station provides the high frequency carrier channel to described relay station simultaneously, and control described relay station and provide the high frequency carrier channel to described user, described user receives the information that described macro base station and described relay station are sent simultaneously, and described user has the carrier aggregation function; Described macro base station provides data, services by direct link to described user, and provides continual data, services described user the handoff procedure of the relay station from described relay station to neighbor cell.
2. a kind of LTE-A relay system according to claim 1 is characterized in that: described macro base station receives the relay station that the user is switched to after the handover request information that the user sends to neighbor cell; Macro base station activates with flyback and lives and control the low frequency carrier signal channel; Described relay station provides the high frequency carrier channel to the user, and carries out data interaction with the user.
3. a kind of LTE-A relay system according to claim 1, it is characterized in that: the data interaction between the foundation of the control channel between described macro base station and relay station and macro base station and relay station completes by back haul link; Foundation and the data interaction of the control channel between described relay station and user complete by access link.
4. the cooperation changing method based on subcarrier of LTE-A relay system as claimed in claim 1 is characterized in that: comprise the following steps:
S1) relay station of user couple and current service and the high frequency carrier channel between macro base station and low frequency carrier signal channel are measured, and measurement report are sent to the macro base station of current service;
S2) after the macro base station of current service receives measurement report, combining wireless resource management information determines whether needs to initiate switching, initiate switching if need, the macro base station of current service judges whether the low frequency carrier signal channel meets the condition that the user provides data, services that is continuously again, if do not meet, the macro base station of current service reselects the low frequency carrier signal channel in all residue candidate low frequency carrier signal channels, and the low frequency carrier signal channel reselected is replaced to original low frequency carrier signal channel; If meet, go to step S3);
S3) judge in each adjacent macro base station and coverage thereof, in each relay station, whether accessible targeted sites is arranged, if do not have, high frequency carrier channel handoff failure; Otherwise, select best access target relay station, and corresponding macro base station sends the switching indication to the best access target relay station, macro base station corresponding to best access target relay station is the corresponding low frequency carrier signal channel of described user assignment, control best access target relay station is the corresponding high frequency carrier channel of described user assignment simultaneously, and the low frequency carrier signal channel of this distribution and high frequency carrier channel information are sent to the macro base station of current service by switching request acknowledgement message;
S4) through step S3) after, described user is synchronized on the high frequency carrier channel of best access target relay station for its distribution, and now the low frequency carrier signal channel between the macro base station of current service and described user is continuously described user data, services is provided;
S5) after described user completes with the best high frequency carrier channel synchronization that accesses the target relay station distribution, the macro base station that the macro base station of current service is corresponding with best access target relay station is carried out respectively low frequency carrier signal channel flyback and is lived and activation mechanism, simultaneously, the reposition that macro base station corresponding to best access target relay station informed the described user of gateway, so that the downlink path of gateway handoff user data, and all packets of receiving are mail to macro base station corresponding to best access target relay station;
S6) through step S5) after, discharging the relay station of the macro base station of described current service, described current service and the resource between described user, switching completes.
5. a kind of cooperation changing method based on subcarrier of LTE-A relay system according to claim 4, it is characterized in that: step S1), described measurement report comprises the Reference Signal Received Quality value that the indication of carrier receiver signal strength, Reference Signal Received Power and user calculate in conjunction with carrier receiver signal strength indication and Reference Signal Received Power.
6. a kind of cooperation changing method based on subcarrier of LTE-A relay system according to claim 5, it is characterized in that: step S2), described combining wireless resource management information determines whether needs the decision condition of initiating switching to be: judge whether the Reference Signal Received Quality of the high frequency carrier channel of described reporting of user meets the minimum requirements of customer service service quality, if do not meet, need to initiate switching.
7. a kind of cooperation changing method based on subcarrier of LTE-A relay system according to claim 5, it is characterized in that: step S2), described low frequency carrier signal channel meets and to be continuously the user and to provide the condition of data, services to be: the Reference Signal Received Quality of the low frequency carrier signal channel of described reporting of user meets the minimum requirements of the service quality of customer service.
8. a kind of cooperation changing method based on subcarrier of LTE-A relay system according to claim 4, it is characterized in that: step S3), describedly judge in each adjacent macro base station and coverage thereof whether have the method for accessible targeted sites to be in each relay station: judge in each relay station in described adjacent macro base station and coverage thereof whether there is the website that meets the QoS of customer resource requirement, resource requirement comprises the direct link resource between macro base station and user, back haul link resource between macro base station and relay station and the access link resource between relay station and user, if each relay in adjacent macro base station and coverage thereof can not meet the requirement of QoS of customer resource requirement, there is no accessible targeted sites.
9. a kind of cooperation changing method based on subcarrier of LTE-A relay system according to claim 4, it is characterized in that: step S3), best access target relay station point is the accessible relay of pilot signal strength maximum.
10. a kind of cooperation changing method based on subcarrier of LTE-A relay system according to claim 4, it is characterized in that: step S5), the macro base station that the macro base station of described current service is corresponding with best access target relay station is carried out respectively the work of low frequency carrier signal channel flyback and is referred to that with activation mechanism the macro base station of current service stops sending data message with the low frequency carrier signal channel to described user, macro base station corresponding to best access target relay station is enabled as the low frequency carrier signal channel of described user assignment, and is continuously described user and sends data message.
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