CN103096400A - Switching control method of relay system - Google Patents
Switching control method of relay system Download PDFInfo
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- CN103096400A CN103096400A CN2011103361489A CN201110336148A CN103096400A CN 103096400 A CN103096400 A CN 103096400A CN 2011103361489 A CN2011103361489 A CN 2011103361489A CN 201110336148 A CN201110336148 A CN 201110336148A CN 103096400 A CN103096400 A CN 103096400A
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Abstract
The invention provides a switching control method of a relay system. The switching control method of the relay system comprises the following steps: A, notifying quality of service (QoS) parameter which is mapped to an user experience (UE) E-radio access bearer (RAB) of an user device on the E-RMB of a retrieval number (RN)-universal terrestrial radio access network (UTRAN) of the relay node to a target host base station T-DeNB by a source host base station S-DeNB; B, ensuring whether the T-DeNB accept the even parity select ( EPS) bearing of a RN evolvement grouping system according to the Qos parameter. Three specific conditions are as follows: accepting the EPS bearing of the RN completely; accepting the EPS bearing of the RN partially; and rejecting the EPS bearing of the RN.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to the method for handover control in a kind of relay system.
Background technology
In the LTE/LTE-A mobile communication system, for the X2 interface switching controls flow process of UE as shown in Figure 1, comprise the steps: in prior art
Step 101: source base station (eNB) sends handover request (Handover Request) message to target eNB, and message comprises Target Cell Identifier and UE contextual information.Wherein, the UE contextual information comprises UE evolved universal terrestrial radio access network (E-UTRAN) RAB (E-RAB that request is set up, E-UTRAN Radio Access Bearer) list, Radio Resource is controlled (RRC, Radio Resource Control) context.
In the UE E-RAB list that request is set up, for the UE E-RAB that each request is set up, comprise service quality (QoS, the Quality of Service) parameter of UE E-RAB sign and UE E-RAB level.Wherein, qos parameter comprises:
(1) QoS type identification (QCI, QoS Class Identifier), standardization QCI span is 1～9.
(2) distribute and keep priority (ARP, Allocation and Retention Priority), comprising:
(3) priority (span is 0～15, and wherein, value is to represent there is no priority at 15 o'clock, and to be 1～14 o'clock priority descend with the increase of numerical value value, and value is to represent that logic error was arranged at 0 o'clock);
(4) seize ability (namely can seize other E-RAB);
(5) be preempted fragility (namely can be seized by other E-RAB).
(6) guarantee bit rate (GBR, Guaranteed Bit Rate) QoS information (only for the carrying of GBR type, comprising descending maximum bit rate (DL MBR), uplink maximum bit speed (ULMBR), descending guarantee bit rate (DL GBR), up assurance bit rate (UL GBR)).
In the RRC context, comprise AS-Config, UE Data Radio Bearer (DRB, the Data Radio Bearer) configuration information of having indicated the cell-of-origin to set up for UE is used for target eNB and determines whether that needing to change UE DRB configures.
UE DRB configuration information comprises the EPS bearing identification (eps-BearerIdentity) (equaling corresponding UE E-RAB ID on numerical value) of UE DRB, DRB identifies (drb-Identity), packet data convergence protocol (PDCP) configuration, Radio Link is controlled (RLC, Radio Link Control)) configuration, Logic Channel Identifier and logic channel configuration.
Step 102: target eNB sends switching request response (Handover Request Acknowledge) message to source eNB, message comprises the UE E-RAB list IE that is accepted, unaccepted UE E-RAB list IE and " target eNB is to source eNB " transparent vessel IE, wherein, the UE E-RAB list IE that is accepted comprises that target eNB is ready to the sign of the UEE-RAB of resource at Target cell for it, and unaccepted UE E-RAB list IE comprises that target eNB does not have the sign of the UE E-RAB of admittance.
For the resource-constrained situation in Target cell place: when the inadequate resource at Target cell place when admitting all UE E-RAB, target eNB may be carried out based on the ARP of each UE E-RAB of self maintained and seize (pre-emption) and process, particularly, target eNB may exclude that source eNB asks a certain or UE E-RAB that some priority is lower also may trigger and discharges self serving a certain or UE E-RAB that some priority is lower.
" target eNB is to source eNB " transparent vessel IE comprises that target eNB is the Handover Command message (being RRCConnectionReconfiguration message) that UE generates, wherein, the RadioResourceConfigDedicated IE of RRCConnectionReconfiguration message comprises DRB-ToAddModList, also comprises alternatively DRB-ToReleaseList.Here, DRB-ToAddModList is used to indicate the reconfiguration information of the UE DRB that needs modification, comprises drb-Identity, comprises alternatively the configuration of PDCP configuration/RLC configuration/logic channel; DRB-ToReleaseList is used to indicate the UE DRB list of release.
Step 103: after source eNB receives Handover Request Acknowledge message, switching command (Handover Command) message in " target eNB is to source eNB " transparent vessel IE (being wireless resource control connection reconfiguration (RRC Connection Reconfiguration) message) is sent to UE.
After step 104:UE receives Handover Command message, reshuffle corresponding PDCP entity/RLC entity/dedicated transmission channel (DTCH, Dedicated Traffic Channel) logic channel according to wherein increase or the DRB list (DRB-ToAddModList) of modification.If message comprises d/d DRB list (DRB-ToReleaseList), UE discharges corresponding PDCP entity, RLC entity, DTCH logic channel, and indicates the release of DRB and eps-BearerIdentity corresponding to DRB that discharges to the NAS layer after handover success is completed.
The method when method for handover control during UE S1 HO and above-mentioned UE X2 HO is similar, all to adjudicate at the qos parameter of the context of cell-of-origin and UE E-RAB the UE E-RAB ID that whether admits this UE E-RAB and will admit and refuse based on UE by target eNB to notify to source eNB, just these a series of process need UE Mobility Management Entity (MME) is auxiliary, does not repeat them here.
In the LTE-A mobile-relay system, for the UE under via node (RN), similar UE evolved packet system (EPS, the Evolved Packet System) carrying of QoS may be mapped in same RNEPS carrying.If RN switches to target DeNB from sourcesink dominant base (DeNB), the switching controls process for RN also can adopt above-mentioned method for handover control for UE.
According to prior art, in RN HO process, if target DeNB can not admit its QoS demand fully to certain RN E-RAB, will exclude this RN E-RAB.Yet, distribution and reservation priority (ARP due to the UE E-RAB that is mapped to this RN E-RAB, Allocation and Retention Priority) may be different, target DeNB possibly can't guarantee to access the ARP demand of E-RAB of the UE of DeNB/RN.Particularly:
Suppose the ARP priority higher (being made as 5) of the RN E-RAB of the first business of being accepted, and the UE E-RAB of Target cell second business of serving is discharged by target DeNB because of ARP priority lower (being made as 10); And meanwhile, be mapped to the ARP priority lower (being made as 12) of UE EPS carrying of the 3rd business of this RN EPS carrying, also will obtain the service of Target cell, the resource that so just is equivalent to ARP priority and is 10 UE EPS carrying is that 12 UE EPS carrying has been seized by ARP priority, thereby having caused ARP priority is that 10 UE EPS carrying carrying the second business has unnecessarily been ended, so damaged the service quality of the UE that Target cell serving.
suppose certain RN E-RAB because ARP priority lower (being made as 10) thus Target cell under DeNB exclude this RN E-RAB, and the ARP priority of the UE E-RAB that Target cell is being served all greater than 10 (for example, value is arranged between 1～9) thus can not be released, so, if be mapped to the ARP priority higher (being made as 6) of a certain UE EPS carrying of this RN EPS carrying, by ARP priority (for example just be equivalent to the resource of this UE EPS carrying, value is between 7～9) lower UE EPS carrying seized, thereby cause this UE EPS carrying can't obtain the service of Target cell, so damaged the service quality of the affiliated UE of this UE EPS carrying.
In sum, target DeNB is carried as that integral body is done switching controls and the ARP demand of having ignored the UE EPS carrying that is mapped to RN EPS carrying with RN EPS, thereby may damage the service quality of specific a certain or some UE.
On the other hand, the resource at target DeNB place may map of services be carried to most of UE EPS that certain RN EPS carries, in prior art, target DeNB refuses this RN EPS carrying, just mean that all UE EPS carryings that are mapped to this RN EPS carrying all can't obtain the service of target DeNB, thereby wasted the resource at target DeNB place.
Summary of the invention
The invention provides the method for handover control in a kind of relay system, can guarantee better the service quality of UE under RN, also avoided the waste of target DeNB place resource.
The embodiment of the present invention provides the method for handover control in a kind of relay system, comprises the steps:
A, sourcesink dominant base S-DeNB will be mapped to the service quality QoS parameter of the user equipment (UE) E-RAB on via node RN E-UTRAN Radio Access Bearer E-RAB and inform target host base station T-DeNB;
B, T-DeNB determine whether to admit RN evolved packet system EPS carrying according to described qos parameter, are specially one of following three kinds of situations: admit RN EPS carrying fully; Part is admitted RN EPS carrying; Or refusal RN EPS carrying.
Preferably, the described X2 that switches to switches, and steps A is: S-DeNB sends the handover request message of the qos parameter that carries the UE E-RAB that is mapped on RN E-RAB to T-DeNB.
Preferably, described handover request message comprises RN E-RAB list, and each in described RN E-RAB list comprises RN E-RAB sign, and the qos parameter that is mapped to the UE E-RAB of this RN E-RAB.
Preferably, described handover request message comprises that further S-DeNB is the RRC context of RN configuration.
Preferably, the described T-DeNB of step B determines whether to admit the basis of RN evolved packet system EPS carrying also to comprise current resource situation.
Preferably, described current resource situation is: the Un interface resource situation of T-DeNB or Target cell, and/or, the hardware resource situation of T-DeNB or Target cell.
Preferably, step B further comprises: T-DeNB returns to handover request ack message to S-DeNB, and handover request ack message comprises the sign of the RN E-RAB that is admitted fully and/or the sign of the RN E-RAB that partly admitted and/or the sign of unaccepted RN E-RAB.
Preferably, described handover request ack message further comprises the admissible qos parameter of the RN E-RAB that is partly admitted.
Preferably, described handover request ack message further comprises: the RN DRB reconfiguration information that the RN E-RAB that is partly admitted is corresponding.
Preferably, described handover request ack message further comprises the sign that is released RN DRB;
Further comprise after step B: after S-DeNB receives handover request ack message, the sign of the described RN of being released DRB is sent to RN; RN discharges corresponding RN DRB; For the UE E-RAB that is mapped on the RN E-RAB corresponding with described RNDRB, RN to the release of UE MME/UEMME direction to this UE E-RAB, perhaps initiates the bearing modification process for this UE E-RAB when switching to T-DeNB when switching to T-DeNB.
Preferably, further comprise after described step B:
After C, S-DeNB receive handover request ack message, described RN DRB reconfiguration information is sent to RN;
D, RN reshuffle corresponding RN DRB after receiving described RN DRB reconfiguration information.
Preferably, described step D further comprises:
For the RN DRB that is reshuffled, RN determines whether this RN DRB can carry the UE E-RAB that is mapped on corresponding RN E-RAB, if can not, discharge described UE E-RAB.
Preferably, the described S1 that switches to switches, and described steps A comprises: S-DeNB sends the handoff requirement message of the qos parameter that carries the UE E-RAB that is mapped on RN E-RAB to RN Mobility Management Entity MME; RN MME sends the handover request message of the qos parameter that carries the UE E-RAB on the described RN of being mapped to E-RAB to T-DeNB.
Preferably, step B further comprises: T-DeNB returns to handover request ack message to RN MME, and handover request ack message comprises the admissible qos parameter of the RN E-RAB that is partly admitted; RNMME sends the switching command message of the admissible qos parameter that carries the RN E-RAB that is partly admitted to S-DeNB.
Preferably, step B further comprises: T-DeNB returns to handover request ack message to RN MME, and described handover request ack message comprises the sign of unaccepted RN E-RAB and the sign that is released RN DRB; RN MME sends the switching command message of carrying the sign of unaccepted RN E-RAB and being released the sign of RNDRB to S-DeNB;
Further comprise after step B: S-DeNB sends the sign of the described RN of being released DRB to RN; RN discharges corresponding RN DRB and indicate the release of RN DRB and EPS bearing identification corresponding to RN DRB that discharges to the NAS layer when switching to T-DeNB; For the UE E-RAB that is mapped on corresponding RN E-RAB, RN to the release of UE MME/UE MME direction to this UEE-RAB, perhaps initiates the bearing modification process for this UE E-RAB when switching to T-DeNB when switching to T-DeNB.
Preferably, the described S1 that switches to switches, and described steps A comprises: S-DeNB sends the handover request message of the qos parameter that carries the UE E-RAB that is mapped on RN E-RAB to source RN MME; Source RN MME sends the forward direction RELOCATION REQUEST message of the qos parameter of the UE E-RAB that comprises the described RN of being mapped to E-RAB to target RN MME; Target RN MME sends the handover request message of the qos parameter that carries the UE E-RAB on the described RNE-RAB of being mapped to T-DeNB.
Preferably, step B further comprises: T-DeNB returns to handover request ack message to target RN MME, and handover request ack message comprises the admissible qos parameter of the RN E-RAB that is partly admitted; Target RN MME sends the forward direction relocation response message of the admissible qos parameter carry the RN E-RAB that described quilt partly admits to source RN MME; Source RN MME sends the switching command message of the admissible qos parameter carry the RN E-RAB that described quilt partly admits to S-DeNB.
Preferably, step B further comprises: T-DeNB returns to handover request ack message to target RN MME, and described handover request ack message comprises the sign of unaccepted RN E-RAB and the sign that is released RNDRB; Target RN MME sends the forward direction relocation response message of the sign of the sign carry described unaccepted RN E-RAB and the described RN of being released DRB to source RN MME; Source RN MME sends the switching command message of the sign of the sign carry described unaccepted RN E-RAB and the described RN of being released DRB to S-DeNB;
Further comprise after step B: S-DeNB sends the sign of the described RN of being released DRB to RN; RN discharges corresponding RN DRB; For the UE E-RAB that is mapped on the RN E-RAB corresponding with described RN DRB, RN to the release of UE MME/UE MME direction to this UEE-RAB, perhaps initiates the bearing modification process for this UE E-RAB when switching to T-DeNB when switching to T-DeNB.
Preferably, described handover request ack message and switching command message further comprise the RN DRB reconfiguration information corresponding to RN E-RAB of partly being admitted.
Preferably, described forward direction relocation response message further comprises the RN DRB reconfiguration information corresponding to RN E-RAB of partly being admitted.
Preferably, further comprise after described step B:
The RN DRB reconfiguration information that the RN E-RAB that C, S-DeNB partly admit described quilt is corresponding sends to RN;
D, RN reshuffle corresponding RN DRB after receiving RN DRB reconfiguration information corresponding to RN E-RAB that described quilt partly admits.
Preferably, described step D comprises:
For the RN DRB that is reshuffled, RN determines whether this RN DRB can carry the UE E-RAB that is mapped on corresponding RN E-RAB, if can not, discharge described UE E-RAB.
As can be seen from the above technical solutions, when T-DeNB admits RN EPS carrying, consider to be mapped to the qos parameter of the UE E-RAB on RN E-RAB, determine it is to admit RN EPS carrying, part to admit RN EPS carrying or refusal RN EPS carrying fully according to this qos parameter.With respect to prior art, the present invention program can satisfy the ARP demand of UE EPS carrying better, thereby guarantees better the service quality of UE, improves target DeNB/ Target cell place resource utilization.
Description of drawings
Fig. 1 is for the X2 interface switching controls schematic flow sheet of UE in prior art;
Fig. 2 is the switching controls schematic flow sheet in the RN X2 HO situation that proposes of the embodiment of the present invention;
Fig. 3 is the switching controls schematic flow sheet in the RN S1 HO situation that proposes of the embodiment of the present invention.
Embodiment
The basic thought of the method for handover control in the relay system that the present invention proposes is, sourcesink dominant base (S-DeNB) will be mapped to the qos parameter of the UE E-RAB on RN E-RAB and inform (directly inform or inform via the forwarding of RN MME and/or target RN MME) target host base station (T-DeNB); T-DeNB determines whether to admit RN EPS carrying according to described qos parameter, specifically can be divided into three kinds of situations: admit RN EPS carrying fully; Part is admitted RN EPS carrying; Refusal RN EPS carrying.For the situation that part is admitted, T-DeNB can send the admissible qos parameter of the RN EPS carrying of admitting for part (directly send or send via the forwarding of RN MME and/or target RNMME) to S-DeNB.For the situation that part is admitted, T-DeNB can also send RN DRB reconfiguration information (directly send or send via the forwarding of RN MME and/or target RN MME), and to S-DeNB, then S-DeNB is with RN DRB reconfiguration information notice RN.RN discharges the UE E-RAB that is mapped to corresponding RN E-RAB based on RN DRB reconfiguration information.
Clearer for the characteristics, know-why and the technique effect that make technical solution of the present invention, below by specific embodiment, the present invention program is further elaborated.
Figure 2 shows that the switching controls flow process in the RN X2 HO situation that the embodiment of the present invention proposes, comprise the steps:
Step 201: sourcesink dominant base (S-DeNB) sends handover request (Handover Request) message to target host base station (T-DeNB), described handover request message comprises RN E-RAB list, each in described RN E-RAB list comprises RN E-RAB sign and qos parameter thereof, and the qos parameter that is mapped to the UE E-RAB of this RN E-RAB.
Can further include S-DeNB in handover request message is the RRC context of RN configuration, described RRC context has comprised AS-Config, AS-Config indicated the RN DRB configuration information that the cell-of-origin set up for RN (equal corresponding RN E-RAB ID on eps-BearerIdentity＜numerical value of each RN DRB 〉, DRB-Identity, PDCP/RLC/ logic channel configurations etc.), T-DeNB can determine whether that needs change RN DRB configuration according to AS-Config.
Step 202:T-DeNB is according to Un interface resource situation and/or the hardware resource situation of the information in Handover Request message and self and/or Target cell, determine whether to admit RN EPS carrying, specifically can be divided into three kinds of situations: admit RN EPS carrying fully; Part is admitted RN EPS carrying; Refusal RN EPS carrying.T-DeNB returns to switching request response (Handover Request Acknowledge) message according to the admittance situation to S-DeNB, and handover request ack message comprises fully the sign of the RNE-RAB of the sign of the sign of the RN E-RAB that admits and/or the RN E-RAB that part is admitted and/or refusal.Situation for the RN E-RAB that exists part to admit, for the admissible qos parameter of the RN E-RAB that is accepted (for example also comprise in handover request ack message, RN E-RAB for the GBR type, T-DeNB deducts the DL GBR value in former qos parameter the DL GBR value of each UE E-RAB that can't admit in the UE E-RAB that is mapped to this RNE-RAB, obtains the value to the admissible DL GBR of this RN E-RAB).
Can further include " target eNB is to source eNB " transparent vessel in handover request ack message, wherein carry switching command (Handover Command) message (being RRCConnectionReconfiguration message), switching command comprise the DRB reconfiguration information that T-DeNB provides for RN＜comprise drb-Identity comprise alternatively the configuration of PDCP configuration/RLC configuration/logic channel.Wherein, for the corresponding RN DRB of RN E-RAB that part is admitted, T-DeNB determines reconfiguration information based on the admissible qos parameter of the RN E-RAB that this part is admitted and the RRC handover preparation information in Handover Request message for this RN DRB.
Step 203:S-DeNB sends to RN with the Handover Command message in " target eNB is to source eNB " transparent vessel (being RRCConnectionReconfiguration message) after receiving Handover Request Acknowledge message.
After step 204:RN receives Handover Command message, reshuffle corresponding PDCP entity/RLC entity/DTCH logic channel according to wherein DRB-ToAddModList.
For certain the RN DRB that is reshuffled, RN can judge that can this RN DRB also carry all UE E-RAB that are mapped to corresponding RN E-RAB, if can not, discharge one or more UE E-RAB that wherein ARP priority is lower and when switching to T-DeNB to UE MME/UE MME direction (for example, send to T-DeNB to process and be transmitted to again UE MME by T-DeNB, lower with) indication is to the release of UE E-RAB.
if Handover Command message comprises DRB-ToReleaseList (wherein having comprised the sign that is released RN DRB), the corresponding RN DRB of RN release (can be specifically to discharge the corresponding PDCP entity of corresponding RN DRB, the RLC entity, the DTCH logic channel) and when switching to T-DeNB indicate the release of RN DRB and eps-BearerIdentity corresponding to RN DRB that discharges to the NAS layer, simultaneously, for the UE E-RAB that is mapped on corresponding RN E-RAB, RN can be to the release of UE MME/UE MME direction to this UE E-RAB when switching to T-DeNB, also can not discharge this UE E-RAB and initiate the bearing modification process for this UE E-RAB when switching to T-DeNB.
Figure 3 shows that the switching controls flow process in the RN S1 HO situation that the embodiment of the present invention proposes, comprise the steps:
Step 301:S-DeNB sends switching demand (Handover Required) message to RN MME, and described handoff requirement message comprises the qos parameter of the UE E-RAB that is mapped to RN E-RAB;
Step 302: if reorientation occurs RN MME, RN MME (as source RN MME) sends forward direction re-positioning request (Forward Relocation Request) message to target RN MME (RN MME_T), and described forward direction RELOCATION REQUEST message comprises the qos parameter of the UE E-RAB that is mapped to RN E-RAB;
Step 303:RN MME (reorientation does not occur) or target RN MME (generation reorientation) send to T-DeNB the qos parameter that handover request (Handover Request) message comprises the UE E-RAB that is mapped to RN E-RAB;
Step 304:T-DeNB determines whether to admit RN EPS carrying according to Un interface resource situation and/or the hardware resource situation of the information in Handover Request message and self and/or Target cell, is divided into three kinds of situations: admit RN EPS carrying fully; Part is admitted RN EPS carrying; Refusal RN EPS carrying, and the sign of the sign of the sign of the RN E-RAB that will be admitted fully and/or the RN E-RAB that partly admitted and/or unaccepted RN E-RAB is carried in handover request ack message (Handover Request Acknowledge) and returns to RN MME or target RN MME.when T-DeNB can only partly admit certain RN E-RAB, the admissible qos parameter that the handover request ack message that T-DeNB returns to RN MME or target RN MME comprises the RN E-RAB that this part is admitted (for example, RN bearer for the GBR type, T-DeNB deducts the UL GBR value in former qos parameter the UL GBR value of the UE E-RAB that is mapped to this RN E-RAB that can't admit, obtain the admissible UL GBR value to this RN E-RAB), and provide reconfiguration information (to comprise drb-Identity based on the RRC handover preparation information in this admissible qos parameter and Handover Request message for corresponding RN DRB, comprise alternatively the configuration of PDCP configuration/RLC configuration/logic channel).
Step 305: if reorientation occurs RN MME, target RN MME comprises the admissible qos parameter for the RN E-RAB that is accepted to RN MME transmission forward direction relocation response (Forward Relocation Response) message, and the reconfiguration information of corresponding RN DRB.
The Handover Command message that step 306:RN MME sends to S-DeNB comprises the admissible qos parameter for the RN E-RAB that is accepted, and the reconfiguration information of corresponding RN DRB.
The Handover Command message that step 307:S-DeNB sends to RN comprises the reconfiguration information of the RN DRB corresponding with the RN E-RAB that is partly admitted.
After step 308:RN receives Handover Command message, reshuffle corresponding PDCP entity/RLC entity/DTCH logic channel according to wherein DRB-ToAddModList.Certain the RN DRB that is reshuffled for RN, RN can judge that can this RN DRB also carry all UE E-RAB that are mapped on corresponding RN E-RAB, if can not, discharge the lower one or more UE E-RAB of ARP priority, and after switching to T-DeNB, to the release of UE MME/UE MME direction to this UE E-RAB.
If switching command message comprises d/d DRB list (DRB-ToReleaseList) (wherein having comprised the sign that is released RN DRB), RN discharges corresponding RN DRB (can be specifically to discharge the corresponding PDCP entity of corresponding RN DRB, RLC entity, DTCH logic channel) and indicate the release of RN DRB and EPS bearing identification (eps-BearerIdentity) corresponding to RN DRB that discharges to the NAS layer when switching to T-DeNB; For the UE E-RAB that is mapped on corresponding RN E-RAB, RN can be to the release of UE MME/UE MME direction to this UE E-RAB when switching to T-DeNB, also can not discharge this UE E-RAB and initiate bearing modification process for this UE E-RAB when switching to T-DeNB.
Due at present in the 3GPP standard, there are the relation of mapping one to one in E-RAB and EPS carrying, therefore, the above-mentioned word that relates to release or the modification of E-RAB, " E-RAB " also can replace with " EPS carrying ".
The present invention program can satisfy the ARP demand of UE EPS carrying, thereby guarantees better the service quality of UE, improves target DeNB/ Target cell place resource utilization.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (22)
1. the method for handover control in a relay system, is characterized in that, comprises the steps:
A, sourcesink dominant base S-DeNB will be mapped to the service quality QoS parameter of the user equipment (UE) E-RAB on via node RN E-UTRAN Radio Access Bearer E-RAB and inform target host base station T-DeNB;
B, T-DeNB determine whether to admit RN evolved packet system EPS carrying according to described qos parameter, are specially one of following three kinds of situations: admit RN EPS carrying fully; Part is admitted RN EPS carrying; Or refusal RN EPS carrying.
2. method according to claim 1, is characterized in that, the described X2 that switches to switches, and steps A is: S-DeNB sends the handover request message of the qos parameter that carries the UE E-RAB that is mapped on RN E-RAB to T-DeNB.
3. method according to claim 2, is characterized in that, described handover request message comprises the RNE-RAB list, and each in described RN E-RAB list comprises RN E-RAB sign, and the qos parameter that is mapped to the UE E-RAB of this RN E-RAB.
4. method according to claim 3, is characterized in that, described handover request message comprises that further S-DeNB is the RRC context of RN configuration.
5. method according to claim 1, is characterized in that, the described T-DeNB of step B determines whether to admit the basis of RN evolved packet system EPS carrying also to comprise current resource situation.
6. method according to claim 5, is characterized in that, described current resource situation is: the Un interface resource situation of T-DeNB or Target cell, and/or, the hardware resource situation of T-DeNB or Target cell.
7. according to claim 2,3 or 4 described methods, it is characterized in that, step B further comprises: T-DeNB returns to handover request ack message to S-DeNB, and handover request ack message comprises the sign of the RN E-RAB that is admitted fully and/or the sign of the RN E-RAB that partly admitted and/or the sign of unaccepted RNE-RAB.
8. method according to claim 7, is characterized in that, described handover request ack message further comprises the admissible qos parameter of the RN E-RAB that is partly admitted.
9. method according to claim 8, is characterized in that, described handover request ack message further comprises: the RN DRB reconfiguration information that the RN E-RAB that is partly admitted is corresponding.
10. method according to claim 7, is characterized in that, described handover request ack message further comprises the sign that is released RN DRB;
Further comprise after step B: after S-DeNB receives handover request ack message, the sign of the described RN of being released DRB is sent to RN; RN discharges corresponding RN DRB; For the UE E-RAB that is mapped on the RN E-RAB corresponding with described RNDRB, RN to the release of UE MME/UEMME direction to this UE E-RAB, perhaps initiates the bearing modification process for this UE E-RAB when switching to T-DeNB when switching to T-DeNB.
11. method according to claim 9 is characterized in that, further comprises after described step B:
After C, S-DeNB receive handover request ack message, described RN DRB reconfiguration information is sent to RN;
D, RN reshuffle corresponding RN DRB after receiving described RN DRB reconfiguration information.
12. method according to claim 11 is characterized in that, described step D further comprises:
For the RN DRB that is reshuffled, RN determines whether this RN DRB can carry the UE E-RAB that is mapped on corresponding RN E-RAB, if can not, discharge described UE E-RAB.
13. method according to claim 1 is characterized in that, the described S1 that switches to switches, and described steps A comprises: S-DeNB sends the handoff requirement message of the qos parameter that carries the UE E-RAB that is mapped on RN E-RAB to RN Mobility Management Entity MME; RN MME sends the handover request message of the qos parameter that carries the UE E-RAB on the described RN of being mapped to E-RAB to T-DeNB.
14. method according to claim 13 is characterized in that, step B further comprises: T-DeNB returns to handover request ack message to RN MME, and handover request ack message comprises the admissible qos parameter of the RN E-RAB that is partly admitted; RN MME sends the switching command message of the admissible qos parameter that carries the RN E-RAB that is partly admitted to S-DeNB.
15. method according to claim 13, it is characterized in that, step B further comprises: T-DeNB returns to handover request ack message to RN MME, and described handover request ack message comprises the sign of unaccepted RNE-RAB and the sign that is released RN DRB; RN MME sends the switching command message of carrying the sign of unaccepted RN E-RAB and being released the sign of RN DRB to S-DeNB;
Further comprise after step B: S-DeNB sends the sign of the described RN of being released DRB to RN; RN discharges corresponding RN DRB and indicate the release of RN DRB and EPS bearing identification corresponding to RN DRB that discharges to the NAS layer when switching to T-DeNB; For the UE E-RAB that is mapped on corresponding RN E-RAB, RN to the release of UE MME/UE MME direction to this UEE-RAB, perhaps initiates the bearing modification process for this UE E-RAB when switching to T-DeNB when switching to T-DeNB.
16. method according to claim 1 is characterized in that, the described S1 that switches to switches, and described steps A comprises: S-DeNB sends the handover request message of the qos parameter that carries the UE E-RAB that is mapped on RN E-RAB to source RN MME; Source RN MME sends the forward direction RELOCATION REQUEST message of the qos parameter of the UE E-RAB that comprises the described RN of being mapped to E-RAB to target RN MME; Target RN MME sends the handover request message of the qos parameter that carries the UE E-RAB on the described RN of being mapped to E-RAB to T-DeNB.
17. method according to claim 16 is characterized in that, step B further comprises: T-DeNB returns to handover request ack message to target RN MME, and handover request ack message comprises the admissible qos parameter of the RN E-RAB that is partly admitted; Target RN MME sends the forward direction relocation response message of the admissible qos parameter carry the RN E-RAB that described quilt partly admits to source RN MME; Source RNMME sends the switching command message of the admissible qos parameter carry the RN E-RAB that described quilt partly admits to S-DeNB.
18. method according to claim 16, it is characterized in that, step B further comprises: T-DeNB returns to handover request ack message to target RN MME, and described handover request ack message comprises the sign of unaccepted RN E-RAB and the sign that is released RN DRB; Target RN MME sends the forward direction relocation response message of the sign of the sign carry described unaccepted RN E-RAB and the described RN of being released DRB to source RN MME; Source RN MME sends the switching command message of the sign of the sign carry described unaccepted RN E-RAB and the described RN of being released DRB to S-DeNB;
Further comprise after step B: S-DeNB sends the sign of the described RN of being released DRB to RN; RN discharges corresponding RN DRB; For the UE E-RAB that is mapped on the RN E-RAB corresponding with described RN DRB, RN to the release of UE MME/UE MME direction to this UEE-RAB, perhaps initiates the bearing modification process for this UE E-RAB when switching to T-DeNB when switching to T-DeNB.
19. according to claim 14,15,17 or 18 described methods, it is characterized in that, described handover request ack message and switching command message further comprise the RNDRB reconfiguration information corresponding to RN E-RAB of partly being admitted.
20. according to claim 17 or 18 described methods is characterized in that, described forward direction relocation response message further comprises the RN DRB reconfiguration information corresponding to RN E-RAB of partly being admitted.
21. method according to claim 19 is characterized in that, further comprises after described step B:
The RN DRB reconfiguration information that the RN E-RAB that C, S-DeNB partly admit described quilt is corresponding sends to RN;
D, RN reshuffle corresponding RN DRB after receiving RN DRB reconfiguration information corresponding to RN E-RAB that described quilt partly admits.
22. method according to claim 21 is characterized in that, described step D comprises:
For the RN DRB that is reshuffled, RN determines whether this RN DRB can carry the UE E-RAB that is mapped on corresponding RN E-RAB, if can not, discharge described UE E-RAB.
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