CN101483898B - Method and apparatus for accelerating RRC connection establishment - Google Patents
Method and apparatus for accelerating RRC connection establishment Download PDFInfo
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Abstract
The invention discloses a method and a device for fastening radio resource to control the setup of RRC connection, wherein, the method comprises that uplink RRC message sent by a piece of UE is received; and when a base station where a target district is located does not have the context of the UE, the message carrying random access related parameters needed by RRC setup is sent to the UE, and the UE initiates a RRC setup process according to the random access related parameters, thus greatly reducing the setup time of the RRC connection, and moreover, balancing network load and the switching method process of the UE among systems with different modes. The device provided by the invention comprises a receiving unit, a sending unit, a detecting unit, and a redirecting unit. According to the method and the device of the invention, the setup time of the RRC can be effectively reduced, business interrupting time can be reduced, the feelings of users can be effectively improved, and network load condition can be effectively balanced, thus leading the network to run more steadily.
Description
Technical field
The present invention relates to wireless communication technology field, the RRC that relates in particular in the wireless communication system connects method and the device of setting up.
Background technology
In the existing mobile communications system, radio resource control RRC (Radio Resource Control) connects be UE with the RRC protocol layer of network side between being connected of a kind of bi-directional point to multipoint of setting up, concerning a UE, have a RRC connection at the most.Be connected between UE and the network side based on RRC and transmit radio network signaling, as carry out wireless resource allocation or the like.RRC sets up at the beginning of being connected call setup, during conversing, keeps always, and behind end of conversation, discharges.Usually, a RRC establishment of connection is to be connected by first signaling to this UE of setting up from the high-rise request of UE, and the RRC establishment of connection comprises the foundation of gravity treatment, permission control and the second layer signaling link of sub-district.
Rrc layer is handled the assignment of RRC connection and control and the needed Radio Resource of user plane.Rrc layer comprises the assignment to a plurality of wireless bearer service Radio Resources in the same RRC connection with allocation radio resource when a RRC connection is set up.RRC controls Radio Resource so that can use unbalanced Radio Resource to communicate (asymmetric up-downgoing) between UE and the RAN in uplink and downlink.RRC also is used to be handed off to purposes such as GSM or other wireless system to the resource assignation of UE.In addition; The locomotive function that RRC connects; Specifically; When setting up RRC and connect, rrc layer is also carried out estimation, decision and execution etc. and is moved function associated with RRC, the function of measuring based on UE to the renewal of GSM or other wireless system switching, district reselecting, cell paging area etc. like equipment.
LTE is the wireless communication standard of future generation that 3GPP is formulating, and has the higher availability of frequency spectrum and transmission speed, lower advantages such as propagation delay time.Radio Link Failure (RLF takes place in wireless communication system (like the LTE system); Radio Link Failure) after; Need carry out the recovery of Radio Link; Be the wireless user equipment re-accessing network, at first carry out the RRC establishment of connection, comprise the foundation of gravity treatment, permission control and the second layer signaling link of sub-district.Be connected between UE and the network based on RRC and transmit radio network signaling, comprise and carry out wireless resource allocation etc.A RRC establishment of connection is to be connected by the signaling of setting up from the high-rise request of UE to this UE.
Usually, being divided into two stages carries out the recovery of Radio Link, as shown in Figure 1; In Phase I, UE selects former sub-district to carry out the recovery of Radio Link earlier, if can't recover in Phase I; Then get into Phase, in Phase, UE independently selects a sub-district to attempt recovering; UE sends RRC connection reconstruction request RRC connection Re-establishment request message to the sub-district of selecting; After this message was received in the sub-district, whether inspection preserved the context of this UE, when having this UE context; Send RRC connection reconstruction RRC connection re-establishment message informing UE Radio Link to UE and recover, UE sends the RRC connection reconstruction to network side and accomplishes RRC connectionre-establishment complete message; When there was not the context of this UE in this sub-district, network sent refusal RRC connection reconstruction RRC connection re-establishment reject message to UE, and UE receives that need initiate new RRC again after this message connects the process of setting up.Because this moment, high-level business did not also discharge, and only was the rrc layer service disconnection, so the susceptibility in order to reduce time of service interruption and to improve the user need shorten the time that RRC sets up as far as possible.
Summary of the invention
In view of this, the present invention provides a kind of RRC of quickening to connect method and the device of setting up.
A kind of radio resource control RRC of accelerating provided by the invention connects the method for setting up, and comprising:
Receive the up RRC message that UE sends;
When there is not the context of this UE in base station, Target cell place, sends and carry RRC and set up the required message that inserts relevant parameter at random and give said UE.
Ground preferably determines whether to allow said UE in the given time or initiate to set up the RRC connection requests after the scheduled time again according to the buffer status report BSR information of carrying in the said up RRC message:
When UE does not have on the data to send out, when Target cell does not have downlink data and reaches predetermined load for UE and Target cell, the sub-district allows said UE in the given time or initiate to set up the RRC connection requests after the scheduled time again.
The present invention also provides a kind of radio resource control RRC of accelerating to connect the device of setting up, and comprising:
Receiving element is used to receive the up RRC message that UE sends;
Transmitting element is used to send message and gives said UE;
When not existing the context of this UE, said transmitting element to send to carry RRC to set up the required message that inserts relevant parameter at random, Target cell place base station eNB do not give said UE.
Ground preferably, this device also comprises:
Detecting unit is used for the load condition of detected cells;
When said receiving element receives the up RRC message that said UE sends,, then detect the information on load of neighbor cell if said detection is loaded greater than predetermined value to the current network of Target cell;
Be redirected the unit, said UE be redirected on the corresponding neighbor cell according to the information on load of said neighbor cell.
The technical scheme that the embodiment of the invention provides is applicable to that the RRC that sets up when calling out between UE and the sub-district is connected foundations, or behind the Radio Link Failure, the RRC connection foundation when recovering Radio Link.UE sends up RRC message and gives Target cell, and target cell base station judges according to the content of this message whether Target cell has the context of this UE, in target cell base station, does not have the context of this UE; Transmission is carried RRC and is set up the required message that inserts relevant parameter at random and give this UE, and this UE initiates RRC according to the said relevant parameter that inserts at random and sets up flow process, makes RRC connection setup time significantly reduce; In addition, the mechanism of the neighbor cell through said UE being redirected to Target cell is carried out equilibrium to network load, and the changing method flow process of UE between the system of different systems; Through the present invention; Can shorten the time that RRC sets up effectively, reduce time of service interruption, effectively raise user's susceptibility; The simultaneously effectively balanced load condition of network makes network to move more steadily.
Description of drawings
Fig. 1 is the recovery process sketch map of Radio Link of the prior art;
The Radio Link method for building up flow chart of Fig. 2 for providing in the first embodiment of the invention;
The Radio Link method for building up flow chart of Fig. 3 for providing in the second embodiment of the invention;
Fig. 4 is the Radio Link method for building up flow chart in the third embodiment of the invention.
Embodiment
The embodiment of the invention is applicable to that the RRC that sets up when calling out between UE and the sub-district is connected, and also is applicable to the wireless link recovery behind the Radio Link Failure.UE sends up RRC message and gives target cell base station; Target cell base station judges according to the content of this message whether Target cell has the context of this UE; If there is not the context of this UE; Then carry RRC and set up the required message that inserts relevant parameter at random to the UE transmission; This UE receives and initiates RRC according to the said relevant parameter that inserts at random after this message and set up flow process, significantly reduces RRC connection setup time, and the mechanism of the neighbor cell through this UE being redirected to Target cell is carried out equilibrium to network load in addition.The embodiment of the invention can effectively reduce the time that RRC sets up, and has reduced time of service interruption, effectively raises user's susceptibility, and the effectively balanced simultaneously load condition of network makes network to move more steadily.
For ease of understanding the present invention, in the face of connecting, briefly describes RRC down.
In the GSM, RRC connects be UE with the RRC protocol layer of UTRAN between being connected of a kind of bi-directional point to multipoint of setting up, concerning a UE, have a RRC connection at the most.Be connected between UE and the UTRAN based on RRC and transmit radio network signaling, as carry out wireless resource allocation or the like.RRC is connected between UE and the sub-district and sets up at the beginning of the call setup, behind end of calling, discharges, and during calling out, keeps always.Usually, a RRC establishment of connection is to be connected by first signaling of setting up from the high-rise request of UE, and the RRC establishment of connection comprises the foundation of gravity treatment, permission control and the second layer signaling link of sub-district.
Relate to during RRC connects Radio Resource appointment, reconfigure and discharge.
Rrc layer is handled the assignment of RRC connection and control and the needed Radio Resource of user plane.Rrc layer comprises the assignment to a plurality of wireless bearer service Radio Resources in the same RRC connection with allocation radio resource when a RRC connection is set up.RRC controls Radio Resource so that can use unbalanced Radio Resource to communicate (asymmetric up-downgoing) between UE and the RAN in uplink and downlink.RRC also is used to be handed off to purposes such as GSM or other wireless system to the resource assignation of UE.In addition; The locomotive function that RRC connects; Specifically; When setting up RRC and connect, rrc layer is also carried out estimation, decision and execution etc. and is moved function associated with RRC, the function of measuring based on UE to the renewal of GSM or other wireless system switching, district reselecting, cell paging area etc. like equipment.
For making principle of the present invention, characteristic and advantage clearer, below combine specific embodiment to describe the present invention with reference to figure.
Embodiment one
In wireless communication system, set up between UE and the sub-district and need set up RRC when calling out and is connected, and after Radio Link Failure RLF takes place, carry out the recovery of Radio Link, promptly wireless user equipment need at first carry out the reconstruction of RRC connection with re-accessing network.Setting up after RRC connects, be connected between UE and the network based on RRC and transmit radio network signaling, comprising and carry out wireless resource allocation etc.
Present embodiment carries out in the process of wireless link recovery with after Radio Link Failure takes place, and reconstruction RRC is connected to example and describes.
With reference to Fig. 2, the Radio Link method for building up flow process that the embodiment of the invention provides comprises the steps:
S201, UE are through being that cell base station eNB sends random access guiding message to network side: send at the ascending resource piece of appointment and insert RA (Random Access) targeting signal preamble at random, to initiate random access procedure;
S202; Network side is that cell base station eNB sends to UE: accidental access response message RAresponse; This message includes the ascending resource UL resource information of UE, sub-district casual network sign C-RNTI parameters such as (Radio network temporary identity);
S203, according to the configuration of accidental access response message, UE sends RRC connection reconstruction request RRC connection re-establishment request message to network, requires to recover RRC and connects.UE can carry buffer status report BSR (Buffer Status Report) information in this message, so that the sub-district decision need distribute great ascending resource to UE.
S204; If the sub-district is the contextual information of this UE not; Cell base station eNB sends refusal to UE and rebuilds RRC connection connection re-establishment reject message so; In this message, carried the relevant parameter of access at random when being used for RRC and setting up, like up resource UL resource etc.
After S205, UE received this message, then UE need be introduced into RRC IDLE state, and then, this UE sets up the required relevant parameter of access at random according to said RRC connection and uses network to specify ascending resource, initiates Initial R RC and sets up flow process.
Embodiment two
The method step S301 to S303 of present embodiment is identical with step S201 to S203 in the previous embodiment one, and with reference to Fig. 3, its difference is,
S304 carries buffer status report BSR information in the up RRC message that UE sends, determine whether to allow this UE in the given time or initiate to set up the RRC connection requests after the scheduled time again according to said buffer status report BSR information,
Such as, when UE does not have on the data to send out and cell base station eNB does not have downlink data to give UE and sub-district when reaching predetermined load yet, allow this UE to initiate to set up the RRC connection requests in the given time again.
After cell base station eNB receives this message; Load condition according to self is adjudicated, and is bigger as if the current network duty ratio, and loading like the current network of sub-district reaches fully loaded 90%; Cell base station eNB sends refusal to UE and rebuilds RRC connection RRC connection re-establishmentreject message so; This message is carried time indication (Wait Time) information, and said time indication information can use the System Frame Number (SFN, System Frame Number) of sub-district to identify.In addition, can also dispose a proprietary preamble ID as required, new C-RNTI gives UE, so that UE initiates to insert at random after waiting for a period of time again.
After S305, UE receive this message, initiate again to insert at random according to the time of indicating in the message.
Embodiment three
Step S201 in the method step S401 to S403 that present embodiment provides and the previous embodiment one) identical to S203, with reference to Fig. 4, its difference is,
S404 after cell base station eNB receives this message, adjudicates according to the load condition of sub-district; If the current network load condition is bigger; Current network load like the sub-district reaches fully loaded 90%, and cell base station eNB tests the load condition of neighbor cell, obtains the information on load of neighbor cell; And from above-mentioned neighbor cell, select the less sub-district of load as Target cell, this UE is redirected on the selected neighbor cell.Be that handoff request HO request message is sent to Target cell in the sub-district, carry the relevant context of UE in the message, Target cell returns handoff response HO response message.
S405; Target cell base station eNB sends refusal to UE and rebuilds RRC connection RRC connectionre-establishment reject message; This message carries relevant parameter and the redirection information (like the information of one or more Target cell) that is used for inserting at random, requires UE to initiate again to insert at random in other sub-districts of appointment.
After S406, UE receive this message, initiate again to insert at random at the Target cell of appointment according to information in the message, perhaps UE selects the Target cell that wherein load is lighter to insert according to the measurement of oneself.
Embodiment four
In the continuous evolution of mobile communication; The situation that has multiple communication standard coexistence; Therefore; Relate to the switching of UE between the system of different systems, promptly the mutual Inter-RAT of wireless access technology (Radio Access Technology) switches, like the switching of UE between LTE and UMTS system.
If after Radio Link Failure RLF takes place, UE switches to the UMTS sub-district will initiate cell update cell update flow process.At this moment, if a ready Target cell has been arranged, promptly this Target cell is preserved the contextual information of this UE, and generally speaking, and the cell base station eNB that this ready Target cell possibly insert with UE is under a RNC control.
UE switches to the situation of UMTS sub-district from the LTE sub-district, specific as follows:
When UE switches to the UMTS sub-district from the LTE sub-district; If above-mentioned UMTS sub-district is not the determined UMTS Target cell in the former sub-district of LTE; But the radio network controller (RNC) at place, above-mentioned UMTS sub-district has the context of this UE, and promptly UMTS Target cell and above-mentioned UMTS sub-district belong to same RNC control.
With this UE from above-mentioned UMTS redirecting cell to the former sub-district of LTE determined UMTS Target cell; Or
Set up new Radio Link in above-mentioned UMTS sub-district, accomplish and switch.
When UE switches to the UMTS sub-district from the LTE sub-district, if the contextual information of no above-mentioned UE among the RNC at place, above-mentioned UMTS sub-district can carry out subsequent treatment according to one of following three kinds of modes:
(1) RNC of above-mentioned UMTS sub-district obtains the contextual information of above-mentioned UE from above-mentioned LTE base station, to carry out the forward direction switching flow;
(2) access of the RNC of above-mentioned UMTS sub-district refusal UE;
(3) RNC of above-mentioned UMTS sub-district is that UE sets up new RRC and connects.
Embodiment five
Another kind of Inter-RAT switch instances is that above-mentioned UE switches to the UMTS sub-district from the LTE sub-district,
If subsequent treatment under same radio network controller (RNC) control, can not carried out according to one of following three kinds of modes in above-mentioned LTE sub-district and above-mentioned UMTS sub-district:
(1) RNC of above-mentioned UMTS sub-district obtains the contextual information of above-mentioned UE from above-mentioned LTE base station, to accomplish the forward direction switching flow;
(2) access of the RNC of above-mentioned UMTS sub-district refusal UE;
(3) RNC of above-mentioned UMTS sub-district is that UE sets up new RRC and connects.
If above-mentioned Target cell is the LTE sub-district, if above-mentioned LTE sub-district does not have the contextual information of this UE,
Then obtain the contextual information of this UE, to carry out the forward direction switching flow from the RNC of above-mentioned UMTS sub-district; Perhaps, refuse the access of this UE.
In the embodiment of the invention, also provide a kind of radio resource control RRC of accelerating to connect the device of setting up, comprising:
Receiving element is used to receive the up RRC message that UE sends;
Transmitting element is used to send message and gives above-mentioned UE;
When not existing the context of this UE, above-mentioned transmitting element to send to carry RRC to set up the required message that inserts relevant parameter at random, Target cell place base station eNB do not give this UE.
And
Detecting unit is used for the load condition of detected cells;
When above-mentioned receiving element receives the up RRC message that above-mentioned UE sends,, then detect the information on load of neighbor cell if above-mentioned detection is loaded greater than predetermined value to the current network of Target cell;
Be redirected the unit, above-mentioned UE be redirected on the corresponding neighbor cell according to the information on load of above-mentioned neighbor cell.
In sum, among the embodiment provided by the invention, set up between UE and the sub-district in the time of need setting up RRC at the beginning of calling out and be connected, or carry out wireless link recovery behind the Radio Link Failure.UE sends up RRC message and gives Target cell; Target cell base station judges according to the content of this message whether Target cell has the context of this UE, and when the context that does not have this UE, transmission is carried RRC and set up the required message that inserts relevant parameter at random to this UE; This UE initiates RRC according to the said relevant parameter that inserts at random and sets up flow process, makes ensuing RRC connection setup time significantly reduce, in addition; Neighbor cell mechanism through this UE being redirected to Target cell is carried out equilibrium to network load; And the changing method flow process of UE between the system of different systems, through the present invention, can effectively reduce the time that RRC sets up; Reduced time of service interruption; Effectively raise user's susceptibility, the simultaneously effectively balanced load condition of network makes network to move more steadily.
It will be appreciated by those skilled in the art that; All or part of module in the foregoing description or each step are to instruct related hardware to realize through program; Said program can be stored in the computer read/write memory medium, and said storage medium is like ROM/RAM, disk, laser disc etc.Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing description is used to explain and explains principle of the present invention.Be appreciated that embodiment of the present invention is not limited thereto.To those skilled in the art, various changes of under the prerequisite that does not break away from essence of the present invention and scope, carrying out and modification all are encompassed within protection scope of the present invention.Therefore, protection scope of the present invention is confirmed by claim.
Claims (13)
1. accelerate the method that radio resource control RRC connects foundation for one kind, it is characterized in that, comprising:
Receive the up RRC message that UE sends;
The context that does not have this UE when base station, Target cell place; Transmission is carried RRC and is set up the required message that inserts relevant parameter at random to said UE; So that behind the said UE entering RRC IDLE state; Set up the required relevant parameter of access at random according to said RRC and use network to specify ascending resource, initiate RRC and set up flow process.
2. the method for claim 1 is characterized in that,
According to the buffer status report BSR information of carrying in the said up RRC message is that said UE distributes ascending resource.
3. the method for claim 1 is characterized in that, also comprises:
Base station, Target cell place determines whether to allow said UE in the given time or initiate to set up the RRC connection requests after the scheduled time again according to the BSR information of carrying in the said up RRC message:
When UE does not have on the data to send out, when Target cell does not have downlink data and reaches predetermined load for UE and Target cell, the sub-district allows said UE in the given time or initiate to set up the RRC connection requests after the scheduled time again.
4. method as claimed in claim 3 is characterized in that, also comprises:
When allowing said UE in the given time or initiate to set up the RRC connection requests after the scheduled time again, in the message of sending, carrying corresponding temporal information to UE.
5. method as claimed in claim 4 is characterized in that,
Said temporal information identifies with the system frame number SFN of sub-district.
6. like claim 3 or 4 described methods, it is characterized in that, also comprise:
In the message that UE sends, carry proprietary preface information preamble ID, new Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI gives UE.
7. the method for claim 1 is characterized in that, also comprises:
When receiving the said up RRC message that UE sends; Target cell detects the load condition of self; Said load then detects the information on load of the neighbor cell of said Target cell greater than predetermined value, and according to the information on load of said neighbor cell said UE is redirected on the corresponding neighbor cell.
8. method as claimed in claim 7 is characterized in that, said said UE is redirected on the corresponding neighbor cell, comprising:
Said UE is redirected on the less neighbor cell of load.
9. like claim 1,2,3 or 7 described methods, it is characterized in that,
Radio Link Failure between UE and cell base station, when needing to recover Radio Link, said up RRC message is RRC connection reconstruction message.
10. the method for claim 1 is characterized in that, when said UE switches to the UMTS sub-district from the LTE sub-district, this method also comprises:
If said UMTS sub-district is not the determined UMTS Target cell in former LTE sub-district, the radio network controller (RNC) at place, said UMTS sub-district has the context of this UE,
With UE from said UMTS redirecting cell to the former sub-district of LTE determined UMTS Target cell; Or
Set up new Radio Link in said UMTS sub-district, accomplish and switch.
11. the method for claim 1 is characterized in that, when said UE switches to the UMTS sub-district from the LTE sub-district, this method also comprises:
If the RNC at place, said UMTS sub-district does not have the contextual information of said UE,
The RNC of said UMTS sub-district obtains the contextual information of said UE from said LTE base station, to carry out the forward direction switching flow; Or
The access of the RNC refusal UE of said UMTS sub-district; Or
The RNC of said UMTS sub-district is that UE sets up new RRC connection.
12. accelerate radio resource control RRC and connect the device of setting up for one kind, it is characterized in that, comprising:
Receiving element is used to receive the up RRC message that UE sends;
Transmitting element is used to send message and gives said UE;
The context that does not have this UE when Target cell place base station eNB; Said transmitting element transmission is carried RRC and is set up the required message that inserts relevant parameter at random to said UE; So that behind the said UE entering RRC IDLE state; Set up the required relevant parameter of access at random according to said RRC and use network to specify ascending resource, initiate RRC and set up flow process.
13. device as claimed in claim 12 is characterized in that, also comprises:
Detecting unit is used for the load condition of detected cells;
When said receiving element receives the up RRC message that said UE sends,, then detect the information on load of neighbor cell if said detection is loaded greater than predetermined value to the current network of Target cell;
Be redirected the unit, said UE be redirected on the corresponding neighbor cell according to the information on load of said neighbor cell.
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| CN1985540A (en) * | 2004-07-14 | 2007-06-20 | 诺基亚公司 | Frequency quality criteria for handover in TD-CDMA cellular communication |
| EP1746856A1 (en) * | 2005-07-22 | 2007-01-24 | Samsung Electronics Co., Ltd. | Method and apparatus for performing handover between core network entities in a packet-switched network |
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