CN102238654A - Method and device for reducing data forwarding in switching process of relay system - Google Patents
Method and device for reducing data forwarding in switching process of relay system Download PDFInfo
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- CN102238654A CN102238654A CN2010101556613A CN201010155661A CN102238654A CN 102238654 A CN102238654 A CN 102238654A CN 2010101556613 A CN2010101556613 A CN 2010101556613A CN 201010155661 A CN201010155661 A CN 201010155661A CN 102238654 A CN102238654 A CN 102238654A
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Abstract
The embodiment of the invention relates to a communication technology and discloses a method and device for reducing data forwarding in a switching process of a relay system. The method comprises the steps: a relay node determines that UE (User Equipment) is switched; state parameters are fed back to a D-eNB (Donor eNB) if preset triggering conditions are met so that the D-eNB regulates a downlink transmitting speed according to the state parameters, wherein the state parameters comprise the data quantity N of the UE, the rate of the downlink transmitting speed Rd1_nb of the D-eNB to the downlink transmitting speed Rd1_rn of the relay node when the cache of the relay node meets the triggering conditions, or the data quantity N of the UE and the downlink transmitting speed Re1_rn of the relay node when the cache of the relay node meets the triggering conditions. According to the embodiment disclosed in the invention, the data flow in the process of switching the UE can be controlled and the data quantity to be forwarded by the relay node can be reduced.
Description
Technical field
The present invention relates to the communication technology, be specifically related to reduce in a kind of relay system handoff procedure the method and apparatus of data forward pass.
Background technology
At present, in the LTE-A system, introduced via node.Via node realizes covering functions such as enhancing, capacity increase, group's mobility and casual network deployment in the LTE-A system.Via node communicates by wireless return link (being that eNB is to the link between the via node) and its affiliated sub-district.Sub-district under the via node is called D-eNB (Donor eNB, main plot enode).
Because the introducing of this new node of via node, originally UE has been divided into D-eNB Uu interface two parts to the Un interface of via node and via node to UE to the Uu wave point of eNB.In this case, UE switches to other nodes from via node following four kinds of scenes:
(1) switches to D-eNB from via node;
(2) switch to other via nodes under the same D-eNB from via node;
(3) switch to other eNB from via node;
(4) switch to other via nodes under other eNB from via node.
In the handoff procedure, owing to reasons such as scheduling, may have the accumulation of some data on the via node, promptly via node need be handed down to the metadata cache of UE at the via node place.In order to guarantee that UE can receive these data, via node need be with the data forwarding of these accumulations to Donor-eNB, and this will waste up (Un mouth) interface-free resources and increase time-delay.
Summary of the invention
The embodiment of the invention provides the method and apparatus that reduces the data forward pass in a kind of relay system handoff procedure, has improved the throughput of system.
For this reason, the embodiment of the invention provides following technical scheme:
Reduce the method for data forward pass in a kind of relay system handoff procedure, comprising:
Via node determines that user terminal UE switches;
If satisfy predetermined trigger condition, then state parameter fed back to main plot enode D-eNB, so that described D-eNB according to described state parameter, adjusts descending transmission rate;
Described state parameter comprises: the ratio r ate of the descending transmission rate Rdl_rn of the descending transmission rate Rdl_nb of data volume N, the D-eNB of UE and via node when satisfying described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of described UE when perhaps satisfying described trigger condition in the via node buffer memory.
Reduce the method for data forward pass in a kind of relay system handoff procedure, comprising:
Main plot enode D-eNB receives the state parameter of via node feedback, and described state parameter is that described via node feeds back after satisfying predetermined trigger condition; Described state parameter comprises: the ratio r ate of the descending transmission rate Rdl_rn of the descending transmission rate Rdl_nb of data volume N, the D-eNB of user terminal UE and via node when satisfying described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of UE when perhaps satisfying described trigger condition in the via node buffer memory;
D-eNB determines the reference time, and the described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
According to described state parameter and described reference time, adjust the descending transmission rate of D-eNB.
A kind of via node comprises:
Switch determining unit, be used for determining that user terminal UE switches;
Feedback unit is used for after described switching determining unit determines that UE switches, if satisfy predetermined trigger condition, then state parameter is fed back to D-eNB, so that D-eNB according to described state parameter, adjusts descending transmission rate;
Described state parameter comprises: the ratio r ate of the descending transmission rate of the descending transmission rate of data volume N, the D-eNB of UE and via node when satisfying described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of described UE when perhaps satisfying described trigger condition in the via node buffer memory.
A kind of D-eNB comprises:
Receiving element, be used to receive the state parameter of via node feedback, described state parameter is that described via node feeds back after satisfying preset trigger condition, and described state parameter comprises: the ratio r ate of the descending transmission rate Rdl_rn of the descending transmission rate Rdl_nb of data volume N, the main plot enode D-eNB of user terminal UE and via node when satisfying predetermined described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of UE when perhaps satisfying described trigger condition in the via node buffer memory;
The reference time determining unit is used for determining the reference time, and the described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
The speed adjustment unit is used for state parameter and definite reference time of described reference time determining unit according to described receiving element reception, adjusts the descending transmission rate of D-eNB.
Reduce the method for data forward pass in a kind of relay system handoff procedure, comprising:
Via node determines that UE switches;
If satisfy predetermined trigger condition, then determine the descending transmission rate adjustment information of D-eNB according to state parameter, described state parameter comprises: data volume N, the descending transmission rate Rdl_rn of via node, the reference time of described UE when satisfying described trigger condition in the via node buffer memory; The described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
The descending transmission rate adjustment information of definite D-eNB is notified to D-eNB, so that described D-eNB adjusts descending transmission rate according to described information.
A kind of via node comprises:
Switch determining unit, be used for determining that UE switches;
The information determining unit, be used for after described switching determining unit determines that UE switches, if satisfy predetermined trigger condition, then determine the descending transmission rate adjustment information of D-eNB according to state parameter, described state parameter comprises: data volume N, the descending transmission rate Rdl_rn of via node, the reference time of described UE when satisfying described trigger condition in the via node buffer memory; The described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
Notification unit, the descending transmission rate adjustment information that is used for the D-eNB that described information determining unit is definite is notified to D-eNB, so that described D-eNB adjusts descending transmission rate according to described information.
Reduce the method and apparatus of data forward pass in the embodiment of the invention relay system handoff procedure, after satisfying predetermined trigger condition, via node is to D-eNB feedback relevant parameters or directly determine the descending transmission rate adjustment information of D-eNB and be notified to D-eNB, correspondingly, the descending transmission rate adjustment information of the D-eNB that D-eNB can determine according to the state parameter or the via node of via node feedback, adjust descending transmission rate, thereby reduced the data volume that via node in switching needs forward pass effectively, the upstream bandwidth and the time-delay that have taken when having reduced the data forward pass have improved the throughput of system.
Description of drawings
Fig. 1 reduces a kind of flow chart of the method for data forward pass at trunk side in the embodiment of the invention relay system handoff procedure;
Fig. 2 is a kind of flow chart that UE switches in the embodiment of the invention;
Fig. 3 reduces the flow chart of the method for data forward pass in the D-eNB side in the embodiment of the invention relay system handoff procedure;
Fig. 4 is a kind of structural representation of embodiment of the invention via node;
Fig. 5 is the structural representation of embodiment of the invention D-eNB;
Fig. 6 reduces the another kind of flow chart of the method for data forward pass at trunk side in the embodiment of the invention relay system handoff procedure;
Fig. 7 is the another kind of structural representation of embodiment of the invention via node.
Embodiment
In order to make those skilled in the art person understand the scheme of the embodiment of the invention better, the embodiment of the invention is described in further detail below in conjunction with drawings and embodiments.
As shown in Figure 1, be to reduce the flow chart of the method for data forward pass in the embodiment of the invention relay system handoff procedure at trunk side, may further comprise the steps:
Particularly, via node can send to D-eNB with described state parameter by handoff request message; Perhaps described state parameter is sent to D-eNB by buffer status report message.Certainly, also can described state parameter be sent to D-eNB by other message.
Reduce the method for data forward pass in the embodiment of the invention relay system handoff procedure, after satisfying predetermined trigger condition, feed back corresponding state parameters by via node to D-eNB, can make D-eNB according to described state parameter, adjust descending transmission rate, thereby reduced the data volume that via node in the handoff procedure needs forward pass effectively, the upstream bandwidth and the time-delay that have taken when having reduced the data forward pass have improved the throughput of system.
Need to prove that in above-mentioned steps 101, described trigger condition can have multiple different setting according to the difference of application need, the flow process of switching below in conjunction with UE is elaborated.
As shown in Figure 2, be a kind of flow chart that UE switches in the embodiment of the invention.
In this embodiment, UE switches to other eNB from via node, may further comprise the steps:
201.UE send measurement report to via node;
202. via node carries out switch decision according to the measurement report of receiving;
203. the via node judgement needs to switch, and then sends handoff request by D-eNB to target eNB;
After 204. target eNB is received described handoff request, reserved resource;
205. then, target eNB sends switching request response by D-eNB to via node;
206. after via node is received described handover request ack message, send switching command to UE;
207.UE after receiving described switching command, carry out hand-off process;
208.UE send random accessing message to target eNB;
209. target eNB is returned accidental access response message to UE after receiving described random accessing message;
210.UE send handoff completion message to target eNB;
211. after target eNB is received described handoff completion message, return switching to UE and finish response message;
212. target eNB is to EPC (Evolved Packet Core, evolution block core net) transmit path handoff request message;
213. after switching was finished, target eNB sent to via node and discharges message related to resources.
In above-mentioned steps 101, described trigger condition can be: Rdl_nb * T+N-Rdl_rn * T＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; The data volume of described UE when N represents to satisfy in the via node buffer memory described trigger condition, N
TRepresent the buffer data size that described UE allows at via node; T=T2-T1, as shown in Figure 2, T1 is the moment that via node sends handoff request, and T2 is the moment that UE receives switching command, and promptly T represents that UE receives the time difference of switching command and via node transmission handoff request.
Difference according to switching mode, described via node can be determined described time difference T or obtain the time difference T of corresponding different UEs switching type in advance by system's actual measurement or emulation or assessment that the maximum switching time that perhaps will preset is as described T according to the UE switching type.
In addition, in above-mentioned steps 101, described trigger condition can also be: Rdl_nb * T
*+ N-Rdl_rn * T
*＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; The data volume of described UE when N represents to satisfy in the via node buffer memory described trigger condition, N
TRepresent the buffer data size that described UE allows at via node; T
*=T2-T0, as shown in Figure 2, T0 predicts the moment that UE will switch, and T2 is the moment that UE receives switching command, i.e. T
*Expression UE receives switching command and predicts UE with the time difference that switches.
According to the difference of switching mode, described via node can calculate described T according to the handoff request time of advent and the default maximum switching time of prediction
*
Wherein, T0 can have several different methods to determine, such as:
(1) measures RSRP (the Reference Signal Received Power of via node as UE, Reference Signal Received Power) (or several times) is lower than RSRPT (the RSRP threshold value that the RSRPT representative is certain) in a time window, or UE measures lasting reduction of RSRP of via node, or the RSRP of the node of the adjacent area that records of UE is higher than the RSRP value of via node in regular hour window (or several times), then can be with these constantly as predicting the moment T0 that UE will switch.
(2) via node away from its covering, then predicts the moment T0 that UE will switch with this moment conduct by the known UE in location.
In the invention process row shown in Figure 1, also can further may further comprise the steps:
If satisfy predetermined trigger condition, then the identification information with reference time or reference time feeds back to D-eNB; The described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
Particularly, can feed back by handoff request message or buffer status report message etc.Certainly, the identification information of described reference time or reference time can feed back to D-eNB with above-mentioned state parameter, also can feed back to D-eNB separately.As shown in Figure 3, be to reduce the flow chart of the method for data forward pass in the embodiment of the invention relay system handoff procedure in the D-eNB side, may further comprise the steps:
Step 302 is determined the reference time, and the described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
Step 303 according to described state parameter and described reference time, is adjusted the descending transmission rate of D-eNB.
The front is mentioned, and described state parameter can be the ratio r ate of the descending transmission rate of the descending transmission rate of data volume N, the D-eNB of described UE when satisfying described trigger condition in the via node buffer memory and via node; Also can be data volume N, the descending transmission rate Rdl_rn of via node of described UE when satisfying described trigger condition in the via node buffer memory.
If the state parameter that D-eNB receives is the ratio r ate of the descending transmission rate of the descending transmission rate of the data volume N at described UE, D-eNB when satisfying described trigger condition in the via node buffer memory and via node, then at first need ratio r ate according to the descending transmission rate Rdl_rn of the descending transmission rate Rdl_nb of D-eNB and via node, and the descending transmission rate of D-eNB, calculate the descending transmission rate Rdl_rn of via node, i.e. Rdl_rn=Rdl_nb/rate.
Data volume N, the descending transmission rate Rdl_rn of via node of D-eNB described UE when satisfying described trigger condition in the via node buffer memory, can adjust descending transmission rate in the following manner:
If Rdl_rn * reference time≤N, then D-eNB no longer issues data and gives via node;
If Rdl_rn * reference time＞N, then the descending transmission rate with D-eNB is adjusted into the Rdl_rn-N/ reference time;
Wherein, the described reference time can be the time difference T that above-mentioned UE receives switching command and via node transmission handoff request, can also be that UE receives switching command and predicts UE with the time difference T that switches
*
As seen, reduce the method for data forward pass in the embodiment of the invention relay system handoff procedure, D-eNB can be according to the state parameter of via node feedback, adjust descending transmission rate, thereby reduced the data volume that via node in switching needs forward pass effectively, the upstream bandwidth and the time-delay that have taken when having reduced the data forward pass have improved the throughput of system.
Need to prove that the described reference time can feed back to D-eNB by via node.
Because the size of described reference time is relevant with different switching modes, and can estimate the corresponding described reference time according to different systems and switching mode, therefore, also can be in D-eNB the corresponding relation of the identification information of stored reference time (such as switching mode) and reference time in advance.As previously described, via node feeds back to D-eNB with the identification information of reference time, and D-eNB is according to own identification information of storing and the corresponding relation of reference time, can determine that this adjusts the required reference time of descending transmission rate.
In addition, via node can not feed back above-mentioned reference time information and the identification information of reference time to D-eNB yet, and D-eNB determines the described reference time according to default maximum switching time.
Need to prove, reduce the method for data forward pass in the embodiment of the invention relay system handoff procedure, can be adapted to UE in the background technology from via node switch to four kinds of scenes of other nodes any one switch in to the control of data flow, can reduce the data volume that via node needs forward pass effectively.
In addition, need to prove, the switching of indication is at a UE in the foregoing description, the buffer data size N that descending transmission rate Rdl_rn, the UE of the descending transmission rate Rdl_nb of data volume N, the D-eNB of described UE, via node allow at via node when therefore, satisfying described trigger condition in the above-mentioned via node buffer memory
TEtc. parameter all is at this UE that need switch, and the relevant parameter of mentioning in the embodiment of back is equally at same UE, follow-up no longer explanation.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, described storage medium, as: ROM/RAM, magnetic disc, CD etc.
Correspondingly, the embodiment of the invention also provides a kind of via node, as shown in Figure 4, is the structural representation of this via node.
In this embodiment, described via node comprises:
In embodiments of the present invention, described feedback unit 402 specifically can feed back to D-eNB with state parameter by handoff request message; Perhaps state parameter is fed back to D-eNB by buffer status report message.
Correspondingly, described via node also can further comprise:
Information parameter determining unit 403, be used for determining the reference time, the described reference time is that UE receives the time difference T that switching command and via node send handoff request, described T determines according to the UE switching type, and is perhaps definite according to default maximum switching time; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*, described T
*For according to handoff request time of advent of prediction and default maximum switching time determining; Perhaps be used for determining the identification information of reference time according to switching type.
Correspondingly, described feedback unit 402, if also be used for satisfying predetermined trigger condition, then the identification information with described reference time or reference time feeds back to D-eNB.
The via node of the embodiment of the invention, after satisfying predetermined trigger condition, to D-eNB feedback corresponding state parameters, can make D-eNB according to described state parameter, adjust descending transmission rate, thereby reduced the data volume that via node in switching needs forward pass effectively, the upstream bandwidth and the time-delay that have taken when having reduced the data forward pass have improved the throughput of system.
Correspondingly, the embodiment of the invention also provides a kind of D-eNB, as shown in Figure 5, is the structural representation of this D-eNB.
In this embodiment, described D-eNB comprises:
Receiving element 502 is used to receive the state parameter that via node feeds back, and described state parameter is that described via node feeds back after satisfying preset trigger condition.Described state parameter comprises: the ratio r ate of the descending transmission rate of the descending transmission rate of data volume N, the D-eNB of described UE and via node when satisfying described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of described UE when perhaps satisfying described trigger condition in the via node buffer memory;
Reference time determining unit 503 is used for determining the reference time, and the described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
In embodiments of the present invention, described reference time determining unit 503 can be determined the described reference time according to the reference time information of via node feedback; Perhaps, determine the described reference time according to identification information and the corresponding relation of identification information that sets in advance and reference time of reference time of via node feedback; Perhaps, determine the described reference time according to default maximum switching time.
Described speed adjustment unit 503 comprises:
Speed is obtained subelement, be used for when described state parameter comprises described ratio r ate, obtain the descending transmission rate Rdl_rn=Rdl_nb/rate of via node by calculating, when described state parameter comprises the descending transmission rate Rdl_rn of via node, obtain the descending transmission rate Rdl_rn of described via node;
Computation subunit is used to calculate the value of Rdl_rn * reference time;
Adjust subelement, be used for when Rdl_rn * reference time≤N, making described D-eNB no longer issue data and giving via node; Perhaps be used for when Rdl_rn * reference time＞N, making described D-eNB that descending transmission rate is adjusted into the Rdl_rn-N/ reference time.
As seen, embodiment of the invention D-eNB can be according to the state parameter of via node feedback, adjust descending transmission rate, thereby reduced the data volume that via node in switching needs forward pass effectively, the upstream bandwidth and the time-delay that have taken when having reduced the data forward pass have improved the throughput of system.
Among the embodiment in front, relay node judges sends D-eNB with corresponding state parameters, thereby makes D-eNB adjust descending transmission rate according to described state parameter after satisfying predetermined trigger condition.In order to reduce the load of D-eNB, can also directly determine the descending transmission rate adjustment information of D-eNB by via node, and the descending transmission rate adjustment information of definite D-eNB is notified to D-eNB according to state parameter.
As shown in Figure 6, be to reduce the another kind of flow chart of the method for data forward pass in the embodiment of the invention relay system handoff procedure at trunk side, may further comprise the steps:
Particularly, at first calculate the value of Rdl_rn * reference time; If Rdl_rn * reference time≤N, the descending transmission rate adjustment information of then determining D-eNB is that D-eNB no longer issues data to via node; If value＞N of Rdl_rn * reference time determines that then the descending transmission rate adjustment information of D-eNB is adjusted into the Rdl_rn-N/ reference time for the descending transmission rate with D-eNB;
Step 603 is notified to D-eNB with the descending transmission rate adjustment information of the D-eNB that determines, so that described D-eNB adjusts descending transmission rate according to described information;
Particularly, can described information be sent to D-eNB by handoff request message; Perhaps described information is sent to D-eNB by buffer status report message.Certainly, also can described information be sent to D-eNB by other message.
In embodiments of the present invention, can described trigger condition be set, such as previously described, can be according to system and application need:
Rdl_nb * T+N-Rdl_rn * T＞N
TPerhaps
Rdl_nb * T
*+ N-Rdl_rn * T
*＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; The data volume of described UE when N represents to satisfy in the via node buffer memory described trigger condition, NT represents the buffer data size that described UE allows at via node.
To be described via node determine according to the UE switching type described T, perhaps according to determining default maximum switching time; Described T
*For described via node according to handoff request time of advent of prediction and default maximum switching time determining.
Certainly, described reference time T or T
*Can before UE switch, estimate or calculate, specifically can not repeat them here with reference to the description among the embodiment of front.
Reduce the method for data forward pass in the embodiment of the invention relay system handoff procedure, after satisfying predetermined trigger condition, determine the descending transmission rate adjustment information of D-eNB by via node, and the descending transmission rate adjustment information of the D-eNB that determines is notified to D-eNB, thereby can make described D-eNB adjust descending transmission rate according to described information, the upstream bandwidth and the time-delay that have taken when having reduced the data forward pass have improved the throughput of system.
Need to prove, reduce the method for data forward pass in the embodiment of the invention relay system handoff procedure, can be adapted to UE in the background technology from via node switch to four kinds of scenes of other nodes any one switch in to the control of data flow, can reduce the data volume that via node needs forward pass effectively.
Correspondingly, the embodiment of the invention also provides a kind of via node, as shown in Figure 7, is the structural representation of this via node.
In this embodiment, described via node comprises:
In embodiments of the present invention, can described trigger condition be set according to system and application need, such as, can be:
Rdl_nb * T+N-Rdl_rn * T＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; The data volume of described UE when N represents to satisfy in the via node buffer memory described trigger condition, N
TRepresent the buffer data size that described UE allows at via node; Perhaps
Rdl_nb * T
*+ N-Rdl_rn * T
*＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; The data volume of described UE when N represents to satisfy in the via node buffer memory described trigger condition, N
TRepresent the buffer data size that described UE allows at via node.
Correspondingly, described via node also can further comprise: first determining unit or second determining unit, wherein:
Described first determining unit, be used for determining that according to the UE switching type UE receives the time difference T of switching command and via node transmission handoff request, receive the time difference T of switching command and via node transmission handoff request the maximum switching time that perhaps will preset as UE;
Described second determining unit is used for the handoff request time of advent and default maximum switching time according to prediction, calculates UE and receives switching command and predict UE with the time difference T that switches
*
In embodiments of the present invention, described information determining unit 702 comprises:
Computation subunit is used to calculate the value of Rdl_rn * reference time;
Determine subelement, if be used for Rdl_rn * reference time≤N, the descending transmission rate adjustment information of then determining D-eNB is that D-eNB no longer issues data to via node; If Rdl_rn * reference time＞N, determine that then the descending transmission rate adjustment information of D-eNB is adjusted into the Rdl_rn-N/ reference time for the descending transmission rate with D-eNB.
Embodiment of the invention via node, after satisfying predetermined trigger condition, determine the descending transmission rate adjustment information of D-eNB, and the descending transmission rate adjustment information of the D-eNB that determines is notified to D-eNB, thereby can make described D-eNB adjust descending transmission rate according to described information, the upstream bandwidth and the time-delay that have taken when having reduced the data forward pass have improved the throughput of system.
More than the embodiment of the invention is described in detail, used embodiment herein the present invention set forth, the explanation of above embodiment just is used for help understanding method and apparatus of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (18)
1. reduce the method for data forward pass in the relay system handoff procedure, it is characterized in that, comprising:
Via node determines that user terminal UE switches;
If satisfy predetermined trigger condition, then state parameter fed back to main plot enode D-eNB, so that described D-eNB according to described state parameter, adjusts descending transmission rate;
Described state parameter comprises: the ratio r ate of the descending transmission rate Rdl_rn of the descending transmission rate Rdl_nb of data volume N, the D-eNB of UE and via node when satisfying described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of described UE when perhaps satisfying described trigger condition in the via node buffer memory.
2. method according to claim 1 is characterized in that, described trigger condition comprises:
Rdl_nb * T+N-Rdl_rn * T＞N
T, wherein, N
TRepresent the buffer data size that described UE allows at via node, T represents that UE receives the time difference of switching command and via node transmission handoff request, to be described via node determine according to the UE switching type described T, perhaps according to determining default maximum switching time; Perhaps
Rdl_nb * T*+N-Rdl_rn * T*＞N
T, wherein, N
TRepresent the buffer data size that described UE allows at via node, T* represents that UE receives switching command and predicts UE with the time difference that switches, and described T* is that described via node is according to determining the handoff request time of advent of prediction and default maximum switching time.
3. method according to claim 1 is characterized in that, described method also comprises:
Via node is determined the identification information of reference time or reference time; The described reference time is that UE receives the time difference T that switching command and via node send handoff request, described T determines according to the UE switching type, and is perhaps definite according to default maximum switching time; The perhaps described reference time is that UE receives switching command and predicts UE with the time difference T that switches
*, described T
*For the handoff request according to prediction arrive between and determine default maximum switching time;
If satisfy predetermined trigger condition, then the identification information with described reference time or described reference time feeds back to D-eNB.
4. reduce the method for data forward pass in the relay system handoff procedure, it is characterized in that, comprising:
Main plot enode D-eNB receives the state parameter of via node feedback, and described state parameter is that described via node feeds back after satisfying predetermined trigger condition; Described state parameter comprises: the ratio r ate of the descending transmission rate Rdl_rn of the descending transmission rate Rdl_nb of data volume N, the D-eNB of user terminal UE and via node when satisfying described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of UE when perhaps satisfying described trigger condition in the via node buffer memory;
D-eNB determines the reference time, and the described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T* that switches;
According to described state parameter and described reference time, adjust the descending transmission rate of D-eNB.
5. method according to claim 4 is characterized in that, described D-eNB determines that the reference time comprises:
D-eNB determines the described reference time according to the reference time information of via node feedback; Perhaps
D-eNB determines the described reference time according to identification information and the corresponding relation of sign that sets in advance and reference time of the reference time of via node feedback;
D-eNB determines the described reference time according to default maximum switching time of information.
6. according to claim 4 or 5 described methods, it is characterized in that described according to described state parameter and described reference time, the descending transmission rate of adjusting D-eNB comprises:
If described state parameter comprises: described ratio r ate, then calculate the descending transmission rate Rdl_rn=Rdl_nb/rate of via node;
If described state parameter comprises: the descending transmission rate Rdl_rn of via node, then extract the descending transmission rate Rdl_rn of described via node;
Calculate the value of Rdl_rn * reference time;
If Rdl_rn * reference time≤N, then D-eNB no longer issues data and gives via node;
If Rdl_rn * reference time＞N, then the descending transmission rate with D-eNB is adjusted into the Rdl_rn-N/ reference time.
7. a via node is characterized in that, comprising:
Switch determining unit, be used for determining that user terminal UE switches;
Feedback unit is used for after described switching determining unit determines that UE switches, if satisfy predetermined trigger condition, then state parameter is fed back to D-eNB, so that D-eNB according to described state parameter, adjusts descending transmission rate;
Described state parameter comprises: the ratio r ate of the descending transmission rate of the descending transmission rate of data volume N, the D-eNB of UE and via node when satisfying described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of described UE when perhaps satisfying described trigger condition in the via node buffer memory.
8. via node according to claim 7 is characterized in that, described via node also comprises:
The information parameter determining unit is used for determining the reference time, and the described reference time is that UE receives the time difference T that switching command and via node send handoff request, described T determines according to the UE switching type, and is perhaps definite according to the maximum switching time of presetting; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*, described T
*For according to handoff request time of advent of prediction and default maximum switching time determining; Perhaps be used for according to the identification information of determining the reference time;
Described feedback unit, if also be used for satisfying predetermined trigger condition, then the identification information with described reference time or reference time feeds back to D-eNB.
9. a D-eNB is characterized in that, comprising:
Receiving element, be used to receive the state parameter of via node feedback, described state parameter is that described via node feeds back after satisfying preset trigger condition, and described state parameter comprises: the ratio r ate of the descending transmission rate Rdl_rn of the descending transmission rate Rdl_nb of data volume N, the main plot enode D-eNB of user terminal UE and via node when satisfying predetermined described trigger condition in the via node buffer memory; Data volume N, the descending transmission rate Rdl_rn of via node of UE when perhaps satisfying described trigger condition in the via node buffer memory;
The reference time determining unit is used for determining the reference time, and the described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
The speed adjustment unit is used for state parameter and definite reference time of described reference time determining unit according to described receiving element reception, adjusts the descending transmission rate of D-eNB.
10. D-eNB according to claim 9 is characterized in that,
Described reference time determining unit specifically is used for the reference time information according to the via node feedback, determines the described reference time; Perhaps, determine the described reference time according to identification information and the corresponding relation of sign that sets in advance and reference time of reference time of via node feedback; Perhaps, determine the described reference time according to default maximum switching time of information.
11., it is characterized in that described speed adjustment unit comprises according to claim 9 or 10 described D-eNB:
Speed is obtained subelement, be used for when described state parameter comprises described ratio r ate, obtain the descending transmission rate Rdl_rn=Rdl_nb/rate of via node by calculating, when described state parameter comprises the descending transmission rate Rdl_rn of via node, obtain the descending transmission rate Rdl_rn of described via node;
Computation subunit is used to calculate the value of Rdl_rn * reference time;
Adjust subelement, be used for when Rdl_rn * reference time≤N, making described D-eNB no longer issue data and giving via node; Perhaps be used for when Rdl_rn * reference time＞N, making described D-eNB that descending transmission rate is adjusted into the Rdl_rn-N/ reference time.
12. reduce the method for data forward pass in the relay system handoff procedure, it is characterized in that, comprising:
Via node determines that UE switches;
If satisfy predetermined trigger condition, then determine the descending transmission rate adjustment information of D-eNB according to state parameter, described state parameter comprises: data volume N, the descending transmission rate Rdl_rn of via node, the reference time of described UE when satisfying described trigger condition in the via node buffer memory; The described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
The descending transmission rate adjustment information of definite D-eNB is notified to D-eNB, so that described D-eNB adjusts descending transmission rate according to described information.
13. method according to claim 12 is characterized in that, described trigger condition is:
Rdl_nb * T+N-Rdl_rn * T＞NT, wherein, Rdl_nb represents the descending transmission rate of D-eNB; NT represents the buffer data size that described UE allows at via node, described T is that described via node is determined according to the UE switching type, perhaps according to determining default maximum switching time; Perhaps
Rdl_nb * T
*+ N-Rdl_rn * T
*＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; NT represents the buffer data size that described UE allows at via node, described T
*For described via node according to handoff request time of advent of prediction and default maximum switching time determining.
14. method according to claim 12 is characterized in that, describedly determines that according to state parameter the descending transmission rate adjustment information of D-eNB comprises:
Calculate the value of Rdl_rn * reference time;
If value≤N of Rdl_rn * reference time, the descending transmission rate adjustment information of then determining D-eNB is that D-eNB no longer issues data to via node;
If value＞N of Rdl_rn * reference time determines that then the descending transmission rate adjustment information of D-eNB is adjusted into the Rdl_rn-N/ reference time for the descending transmission rate with D-eNB.
15., it is characterized in that described descending transmission rate adjustment information with definite D-eNB is notified to D-eNB and comprises according to each described method of claim 12 to 14:
By handoff request message described information is sent to D-eNB; Perhaps
By buffer status report message described information is sent to D-eNB.
16. a via node is characterized in that, comprising:
Switch determining unit, be used for determining that UE switches;
The information determining unit, be used for after described switching determining unit determines that UE switches, if satisfy predetermined trigger condition, then determine the descending transmission rate adjustment information of D-eNB according to state parameter, described state parameter comprises: data volume N, the descending transmission rate Rdl_rn of via node, the reference time of described UE when satisfying described trigger condition in the via node buffer memory; The described reference time is: UE receives the time difference T of switching command and via node transmission handoff request; Perhaps UE receives switching command and predicts UE with the time difference T that switches
*
Notification unit, the descending transmission rate adjustment information that is used for the D-eNB that described information determining unit is definite is notified to D-eNB, so that described D-eNB adjusts descending transmission rate according to described information.
17. via node according to claim 16 is characterized in that, described trigger condition is:
Rdl_nb * T+N-Rdl_rn * T＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; N
TRepresent the buffer data size that described UE allows at via node; Perhaps
Rdl_nb * T
*+ N-Rdl_rn * T
*＞N
T, wherein, Rdl_nb represents the descending transmission rate of D-eNB; N
TRepresent the buffer data size that described UE allows at via node;
Described via node also comprises: first determining unit or second determining unit, wherein:
Described first determining unit, be used for determining that according to the UE switching type UE receives the time difference T of switching command and via node transmission handoff request, receive the time difference T of switching command and via node transmission handoff request the maximum switching time that perhaps will preset as UE;
Described second determining unit is used for the handoff request time of advent and default maximum switching time according to prediction, calculates UE and receives switching command and predict UE with the time difference T that switches
*
18., it is characterized in that described information determining unit comprises according to claim 16 or 17 described via nodes:
Computation subunit is used to calculate the value of Rdl_rn * reference time;
Determine subelement, if be used for Rdl_rn * reference time≤N, the descending transmission rate adjustment information of then determining D-eNB is that D-eNB no longer issues data to via node; If Rdl_rn * reference time＞N, determine that then the descending transmission rate adjustment information of D-eNB is adjusted into the Rdl_rn-N/ reference time for the descending transmission rate with D-eNB.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1812368A (en) * | 2005-01-25 | 2006-08-02 | 华为技术有限公司 | Method for transmitting message data by IP facsimile gateway |
| CN101534523A (en) * | 2009-04-08 | 2009-09-16 | 西安电子科技大学 | Cognitive network route method with service sensing ability |
| CN101647307A (en) * | 2007-03-26 | 2010-02-10 | 高通股份有限公司 | In communication network, carry out device for switching and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1812368A (en) * | 2005-01-25 | 2006-08-02 | 华为技术有限公司 | Method for transmitting message data by IP facsimile gateway |
| CN101647307A (en) * | 2007-03-26 | 2010-02-10 | 高通股份有限公司 | In communication network, carry out device for switching and method |
| CN101534523A (en) * | 2009-04-08 | 2009-09-16 | 西安电子科技大学 | Cognitive network route method with service sensing ability |
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