CN1997216A - Method for user device switching in the long evolving network - Google Patents
Method for user device switching in the long evolving network Download PDFInfo
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- CN1997216A CN1997216A CNA2006100056252A CN200610005625A CN1997216A CN 1997216 A CN1997216 A CN 1997216A CN A2006100056252 A CNA2006100056252 A CN A2006100056252A CN 200610005625 A CN200610005625 A CN 200610005625A CN 1997216 A CN1997216 A CN 1997216A
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Abstract
This invention discloses one long time progress network user device switch method, which comprises the following steps: according to whether or not near other encode, dividing the down area of encode into near and non near areas; when UE enters near area, establishing UE RRC message image in GW and establishing message copy in RRC near encode; if the results are to switch UE to near encode and then directly using the copy message to align wireless materials to fulfill switch.
Description
Technical field
The present invention relates to long-term evolving network, particularly the method for user device switching in the long-term evolving network.
Background technology
Mobile communication technology entered since the second generation mobile communication (The Second Generation is called for short " 2G ") from 20 end of the centurys, had obtained developing rapidly.But along with the increase of number of users, and to the improving constantly of requirements such as class of business and performance, 2G demonstrates the restriction at aspects such as data transmission capabilities gradually.Therefore, the 3G (Third Generation) Moblie that data transmission capabilities is stronger (The Third Generation, be called for short " 3G ") has entered the high speed development stage, and moving communicating field presents by 2G progressively to the situation of 3G transition.
When the 3G system progressively entered commercialization, industry had begun Research on New work.The company that has is called super 3G (Super 3G) technology with these new technologies, also has company to be called the 3.9G technology.3.9G the data traffic transmission speed of technology will reach about 100Mbps, and introduce a large amount of advanced technologies, as OFDM (Orthogonal Frequency Division Multiplexing, be called for short " OFDM ") and multiple-input and multiple-output (Multiple Input Multiple Output, be called for short " MIMO ") etc., unification is called the evolved technology of 3G with these advanced technologies in China, also is the E3G technology.
In order to realize the standardization of E3G technology, since the end of the year in 2004, third generation partner program (3rd Generation Partnership Project is called for short " 3GPP ") and 3GPP2 successively began corresponding research work.
Along with high speed downlink packet inserts (High Speed Downlink Packet Access, be called for short " HSDPA "), the introducing of enhanced uplink enhancement techniques such as (Enhanced Uplink), the 3GPP wireless access technology has very high competitiveness in a few years from now on.Yet in order to guarantee the competitiveness of longer time (as 10 years or longer), 3GPP started Long Term Evolution (LongTerm Evolution is called for short " LTE ") project since the second half year in 2004.
In order to support the mixed networking of 2G in the evolution process of 3G, circuit commutative field at mobile communication system, 3G standard universal mobile telecommunications system (Universal Mobile TelecommunicationsSystem, be called for short " UMTS ") stipulated the basic configuration of the public land mobile net (Public Land Mobile Networks is called for short " PLMN ") of support circuit-switched territory and grouping commutative field service and interface.
Stack up is said, the UMTS system is by subscriber equipment (User Equipment, abbreviation " UE "), universal mobile telecommunications system grounding wireless access network (UMTS Terrestrial Radio Access Network, be called for short " UTRAN ") and core net (Core Network is called for short " CN ") composition.
The RNS (Radio NetworkSubsystem is called for short " RNS ") that comprises many CN of being connected among the UTRAN again.A RNS comprises a radio network controller (Radio NetworkController is called for short " RNC ") and one or more base station (NodeB), and each NodeB covers one or more sub-districts.
In the LTE network, the network configuration of NodeB, the RNC of 3G network and CN three node layers is simplified to the structure of two-layer node, as shown in Figure 1, the RNC function is split to NodeB, be called enode b (evolutional Node B, be called for short " eNodeB ") and upper level node in, this upper level node is called gateway (Gateway, abbreviation " GW ") node, central node or Anchor.
Simultaneously, the state of protocol processes also is simplified, and divides three kinds of states, is respectively off-line (LTE-Detached), idle (LTE-Idle) and (LTE-RRC-Active) state of activation.Specifically, under the LTE-Detached state, network side does not receive any information of UE; Not having RRC during the LTE-Idle state connects; There is RRC to connect under the LTE-RRC-Active state.
In the LTE in future network, the business of how different demands will be provided, for some special real time business wherein,, need satisfy the requirement of low packet loss ratio such as visual telephone (Video Phone) etc.Simultaneously in the discussion of LTE network, because the utilization of shared channel makes soft handover be cancelled.Therefore, at direct-cut operation (Hard Hand Over, be called for short " HHO ") data interruption of bringing or the problems such as time of interruption, some companies have proposed the scheme of some solutions, such as data forwarding (DataForwarding), two broadcasting (Bi-casting) etc.But because the characteristic of real time business and non-real-time service is different, its requirement is also inequality.For example, for non-real-time service, the harmless handover scheme of data forwarding can well be finished its demand; But for real time business, just relatively be fit to use two schemes of broadcasting.
In UMTS R6 system, hard handover scheme does not have data forwarding or twoly broadcasts the auxiliary of scheme, can cause certain loss of data or interrupt time delay, when striding the switching of RNC, Radio Link control (the Radio Link Control of receiving terminal, abbreviation " RLC ") entity can be reset, and parameter will be refreshed.
In the existing LTE scheme discuss, utilize two that the RLC function proposes on the basis of GW to broadcast scheme as shown in Figure 2.
Between eNodeB2 and eNodeB4 and UE, set up the RRC administrative relationships, and safeguard the RRC management function, also promptly safeguard the RRC context (Context) of UE by being arranged in eNodeB2 RRC management entity by source eNodeB2; Safeguard that by GW no RRC connects UE down and manages, also promptly safeguard about the UE zhang.The position of processing entities as shown in Figure 3.
ENodeB switches before the generation, and the RRC context is preserved by possible switching candidate target eNodeB4, but GW does not preserve the contextual mirror image copies of RRC.The behavior of RRC context in candidate target eNodeB4 safeguarded by source eNodeB2.
In actual applications, there is following problem in such scheme: in the LTE network between eNodeB handover delay bigger.
Cause the main cause of this situation to be, because the RRC context of no UE among the GW, GW is uncontrollable to be broadcast the two of source eNodeB and target eNode B, yet, the control signaling of source eNodeB carrying is fewer, and making needs the certain algorithm of carrying to safeguard the process of choosing candidate target eNodeB, so, this chooses the process complexity, and handover delay is big.
Summary of the invention
In view of this, main purpose of the present invention is to provide the method for user device switching in a kind of long-term evolving network, makes in the LTE network that handover delay is optimized between eNodeB.
For achieving the above object, the invention provides the method for user device switching in a kind of long-term evolving network, comprise following steps:
A when the adjacent abutting subdistrict of the subscriber equipment service of entering enode b and other enode b, this service enode b by gateway node with the Radio Resource of this subscriber equipment control the context copy be delivered to this abutting subdistrict in abutting connection with enode b;
If it is described in abutting connection with enode b that the described subscriber equipment of B switches to, then use this to finish switching in abutting connection with the Radio Resource control context copy in the enode b.
Wherein, described steps A further comprises following substep:
When the adjacent abutting subdistrict of the subscriber equipment service of entering enode b and other enode b, the Radio Resource that this service enode b is set up this subscriber equipment at described gateway node is controlled contextual mirror image;
Described gateway node with the copy of described Radio Resource control context mirror image be delivered to this abutting subdistrict in abutting connection with enode b.
In this external described method, also comprise following steps:
When the Radio Resource control context of described subscriber equipment changed, described service enode b upgraded the mirror image of this Radio Resource control context in described gateway node synchronously.
In this external described method, also comprise following steps:
After the mirror image in the described gateway node was upgraded synchronously by described service enode b, this gateway node was according to presetting the described Radio Resource control context copy in enode b of policy update.
In this external described method, also comprise following steps:
When described subscriber equipment left described abutting subdistrict, deletion was controlled the context copy with the Radio Resource in the adjacent described enode b of this abutting subdistrict.
In this external described method, also comprise following steps:
When described subscriber equipment when described abutting subdistrict enters not with the adjacent non-adjacent sub-district of other enode b, delete the Radio Resource control context mirror image of this subscriber equipment in described gateway node.
In this external described method, described step B also comprises following substep:
In the described process of switching in abutting connection with enode b, described gateway node uses the Radio Resource control context mirror image of local this subscriber equipment of preserving to carry out two broadcasting at described subscriber equipment.
In this external described method, the handoff procedure among the described step B also comprises following substep:
Described service enode b is made the judgement of switching between enode b as the source enode b, and the notification target enode b;
Described target enode b uses the Radio Resource control context copy of described subscriber equipment to carry out wireless money distribution and Radio Resource is prepared result notification source enode b;
Be failure if described Radio Resource is prepared the result, then described source enode b is abandoned switch decision;
If it is successfully that described Radio Resource is prepared the result, then described source enode b sends switching command to described subscriber equipment;
Described subscriber equipment switches to the target enode b according to switching command with business, and sends switching authentic information to the target enode b;
After the target enode b was received switching authentic information, the notification source enode b discharged related resource.
In this external described method, the information interaction between the described enode b is by described gateway node transfer.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, according to whether with other eNodeB adjacency, eNodeB subordinate's sub-district is divided into abutting subdistrict and non-adjacent sub-district, when UE enters abutting subdistrict, set up the RRC context mirror image of this UE at GW, and set up RRC context copy at adjacency eNodeB by GW, if handoff decision result is for to switch to this in abutting connection with eNodeB with UE, then directly use the RRC context copy distributing radio resource among this eNodeB to finish switching.
When the RRC change in context among the service eNodeB, the mirror image among the GW is upgraded synchronously, and the copy in eNodeB then presets policy update (not necessarily upgrading synchronously in real time) by the GW basis.If UE enters non-adjacent sub-district, then delete mirror image among the GW and the copy in the eNodeB.
Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly because in may becoming each eNodeB of switching target, all set up RRC context copy in advance, so when initiating actual the switching, can directly use this RRC context copy, save prior art and behind switch decision, sent the RRC context needed time of copy from source eNodeB to target eNode B temporarily, feasible switching is more rapid, can satisfy the requirement of real time business especially.
Because in GW, set up with source eNodeB in the mirror image that upgrades in real time synchronously of RRC context, so can directly use the mirror image among the GW to realize two technology of broadcasting.
Because the RRC context copy among the adjacency eNodeB is upgraded by presetting strategy, and the RRC context copy that a little bias is arranged still can be competent at switch operating, do not adopt the mode of upgrading synchronously in real time so this strategy can require, can reduce the communication pressure of GW like this.
By timely release GW and in the eNodeB RRC context mirror image or copy, can reduce to GW with in abutting connection with the resource occupation of eNodeB.
Description of drawings
Fig. 1 is a LTE Network Layering structural representation in the prior art;
Fig. 2 is the UE changing method schematic diagram of LTE network in the prior art;
Fig. 3 is a LTE network processes provider location schematic diagram in the prior art;
Fig. 4 is the changing method flow chart according to UE in the LTE network of first embodiment of the invention;
Fig. 5 is the position view according to UE in the LTE network of first embodiment of the invention;
Fig. 6 is the changing method flow chart according to UE in the LTE network of second embodiment of the invention;
Fig. 7 is the position view according to UE in the LTE network of second embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
ENodeB and GW two-layer node structure at the LTE network, before switching between the eNodeB, the contextual mirror image of the RRC of UE is delivered to GW, and gives the copy that issues this mirror image in abutting connection with eNodeB according to the residing sub-district of UE, before having realized switching to the preliminary treatment of air resource.
In the LTE network of first embodiment of the invention the UE changing method as shown in Figure 4, wherein, UE through abutting subdistrict C01, moves to the abutting subdistrict C08 of target eNode B 3, as shown in Figure 5 from the abutting subdistrict C09 of source eNodeB1.
In step 401, UE and source eNodeB1 have the transmission of business datum, and enter into abutting subdistrict C01 (C01 and eNodeB3 adjacency) from non-adjacent sub-district C09.
In step 402, in case UE enters abutting subdistrict C01, source eNodeB1 promptly sends the RRC context of this UE to GW, set up the contextual mirror image of this RRC by GW, and the RRC context of this UE among this mirror image and the source eNodeB1 keeps upgrading synchronously.
In step 403, the mirror image of setting up by GW sends the contextual copy of this RRC to target eNode B 3, and by presetting strategy the RRC context copy among the adjacency eNodeB is upgraded.Because there is the RRC context copy of a little bias still can be competent at switch operating, so can requiring, this strategy do not adopt the mode of upgrading synchronously in real time, can reduce the communication pressure of GW like this.Need to prove that among the present invention, " mirror image " expression and the identical and real-time update of original paper, " copy " expression are duplicated by original paper and obtained but equipment can only guarantee as far as possible real-time update.
If UE enters abutting subdistrict C03, because C03 is adjacent with eNodeB3 and eNodeB4 respectively, GW can send the contextual copy of RRC of this UE simultaneously to the eNodeB of these two adjacency.
In step 404, along with the abutting subdistrict C08 that moves into target eNode B 3 of UE, when needing to switch, source eNodeB1 sends switch decision to GW, and notice is switched.
In step 405, the switch decision that GW will switch is transmitted to target eNode B 3.
In step 406, after target eNode B 3 is received this judgement, carry out wireless resource allocation, and notice GW is allocated successfully the result of (or failure) according to the RRC context copy of this UE.In the eNodeB that may become switching target, set up RRC context copy in advance, make and when initiating actual the switching, can directly use this RRC context copy, save prior art and behind switch decision, sent RRC needed time of zhang copy up and down from source eNodeB to target eNode B temporarily, feasible switching is more rapid, can satisfy the requirement of real time business especially.
In step 407, GW will be allocated successfully the result notification of (or failure) and give source eNodeB1, carry out two mechanism of broadcasting simultaneously, and promptly the while sends the business datum of this UE to source eNodeB1 and target eNode B 3.Because in GW, set up with source eNodeB1 in the mirror image that upgrades in real time synchronously of RRC context, so can directly use the mirror image among the GW to realize two technology of broadcasting.
In step 408, source eNodeB1 for being allocated successfully, sends switching command to UE according to this notice.In addition, if this is notified to distributing failure, then source eNodeB1 abandons current switching.
In step 409, after UE receives switching command, business is switched to target eNode B 3.
In step 410, in the time of service switchover, UE sends switching authentic information to target eNode B 3.
In step 411, receive the message of UE when target eNode B 3 after, just send to discharge resource notification to GW.
In step 412, this release resource notification is by being given to source eNodeB1 among the GW, and source eNodeB1 notifies according to this, discharges the Radio Resource between itself and this UE, finishes switching.
In the LTE network of second embodiment of the invention the UE changing method as shown in Figure 6, wherein, UE moves to non-adjacent sub-district C04 via abutting subdistrict C02, as shown in Figure 7 from the abutting subdistrict C01 of source eNodeB1.
As UE during, according to above-mentioned execution mode, when UE enters abutting subdistrict C01, in GW, set up the RRC context mirror image of this UE, and in eNodeB3, set up the copy of this mirror image at abutting subdistrict C01.
The similar step 401 of step 601.
In step 602, UE has left abutting subdistrict C01, sends the notice that UE leaves abutting subdistrict C01 by eNodeB1 to GW.
In step 603, GW notifies according to this, sends the indication of deletion copy to eNodeB 3.Make eNodeB3 discharge the copy in the eNodeB in time, can reduce taking like this adjacency eNodeB resource.
In step 604, UE enters abutting subdistrict C02 (C02 and eNodeB 4 adjacency), and eNodeB1 promptly sends the notice that UE enters abutting subdistrict C02 to GW.
In step 605, after GW receives this notice,, send the copy of this mirror image to eNodeB4 according to the contextual mirror image of the RRC of this UE, eNodeB4 sets up this copy.
In step 606, GW carries out two mechanism of broadcasting, and sends business datum to eNodeB1.
In step 607, GW sends business datum to eNodeB4.
Step 608 and step 609 be similar and step 602 and step 603 respectively, all is situation about leaving under the abutting subdistrict.
In step 610, UE enters non-adjacent sub-district C04 (C04 not with other eNodeB in abutting connection with), and eNodeB1 promptly sends the notice that UE enters non-adjacent sub-district C04 to GW.According to this notice, GW promptly deletes the contextual mirror image of RRC of this UE.By RRC context mirror image among the timely release GW, can reduce taking to the GW resource.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (9)
1. the method for user device switching in the long-term evolving network is characterized in that, comprises following steps:
A when the adjacent abutting subdistrict of the subscriber equipment service of entering enode b and other enode b, this service enode b by gateway node with the Radio Resource of this subscriber equipment control the context copy be delivered to this abutting subdistrict in abutting connection with enode b;
If it is described in abutting connection with enode b that the described subscriber equipment of B switches to, then use this to finish switching in abutting connection with the Radio Resource control context copy in the enode b.
2. the method for user device switching in the long-term evolving network according to claim 1 is characterized in that, described steps A further comprises following substep:
When the adjacent abutting subdistrict of the subscriber equipment service of entering enode b and other enode b, the Radio Resource that this service enode b is set up this subscriber equipment at described gateway node is controlled contextual mirror image;
Described gateway node with the copy of described Radio Resource control context mirror image be delivered to this abutting subdistrict in abutting connection with enode b.
3. the method for user device switching in the long-term evolving network according to claim 2 is characterized in that, also comprises following steps:
When the Radio Resource control context of described subscriber equipment changed, described service enode b upgraded the mirror image of this Radio Resource control context in described gateway node synchronously.
4. the method for user device switching in the long-term evolving network according to claim 3 is characterized in that, also comprises following steps:
After the mirror image in the described gateway node was upgraded synchronously by described service enode b, this gateway node was according to presetting the described Radio Resource control context copy in enode b of policy update.
5. the method for user device switching in the long-term evolving network according to claim 2 is characterized in that, also comprises following steps:
When described subscriber equipment left described abutting subdistrict, deletion was controlled the context copy with the Radio Resource in the adjacent described enode b of this abutting subdistrict.
6. the method for user device switching in the long-term evolving network according to claim 5 is characterized in that, also comprises following steps:
When described subscriber equipment when described abutting subdistrict enters not with the adjacent non-adjacent sub-district of other enode b, delete the Radio Resource control context mirror image of this subscriber equipment in described gateway node.
7. the method for user device switching in the long-term evolving network according to claim 3 is characterized in that, described step B also comprises following substep:
In the described process of switching in abutting connection with enode b, described gateway node uses the Radio Resource control context mirror image of local this subscriber equipment of preserving to carry out two broadcasting at described subscriber equipment.
8. according to the method for user device switching in each described long-term evolving network in the claim 1 to 7, it is characterized in that the handoff procedure among the described step B also comprises following substep:
Described service enode b is made the judgement of switching between enode b as the source enode b, and the notification target enode b;
Described target enode b uses the Radio Resource control context copy of described subscriber equipment to carry out wireless money distribution and Radio Resource is prepared result notification source enode b;
Be failure if described Radio Resource is prepared the result, then described source enode b is abandoned switch decision;
If it is successfully that described Radio Resource is prepared the result, then described source enode b sends switching command to described subscriber equipment;
Described subscriber equipment switches to the target enode b according to switching command with business, and sends switching authentic information to the target enode b;
After the target enode b was received switching authentic information, the notification source enode b discharged related resource.
9. the method for user device switching in the long-term evolving network according to claim 8 is characterized in that, the information interaction between the described enode b is by described gateway node transfer.
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| CN2006100056252A CN1997216B (en) | 2006-01-03 | 2006-01-03 | Method for user device switching in the long evolving network |
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| CN101848506A (en) * | 2010-03-25 | 2010-09-29 | 新邮通信设备有限公司 | Switching method in long-termed evolution enhancing system and system |
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| CN101369912B (en) * | 2007-08-13 | 2011-04-06 | 大唐移动通信设备有限公司 | Customer equipment context updating method and apparatus |
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| EP1401218A1 (en) * | 2002-09-19 | 2004-03-24 | Siemens Aktiengesellschaft | Method for the transmission of broadcast and multicast information in a mobile communications system |
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| CN101848506A (en) * | 2010-03-25 | 2010-09-29 | 新邮通信设备有限公司 | Switching method in long-termed evolution enhancing system and system |
| CN101848506B (en) * | 2010-03-25 | 2012-10-10 | 新邮通信设备有限公司 | Switching method in long-termed evolution enhancing system and system |
| CN102256305A (en) * | 2010-05-21 | 2011-11-23 | 中兴通讯股份有限公司 | Radio access network node and internode load sharing method |
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