CN101483892A - Switching command sending method and base station - Google Patents
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Abstract
The invention discloses a transmit method for switching a command, which is applied in a long-term evolutionary system, and the method comprises that: a source base station transmits a first switching message to a terminal, and the first switching message refers to a target base station message with a variation period larger than a preset value; when affirming the terminal needing to initiate switching, the source base station transmits a switching command to the target base station; and the source base station receives switching response returned by the target base station and transmits a second switching message to the terminal according to the switching response of the target base station, and the second switching message refers to the target base station message with a variation period smaller than the preset value. The embodiment of the invention also provides a base station. By adopting the technical proposal of the embodiment of the invention, the contents of the first switching message and the second switching message are made clear, and the method for sending the switching message by two steps in an LTE system is led to become an operable technical proposal, thus perfecting the method, and guaranteeing the switching message to be timely, reliably and completely transmitted to the terminal.
Description
Technical field
The present invention relates to the communications field, particularly a kind of sending method of switching command and base station.
Background technology
Along with development of Communication Technique, improve day by day for the requirement of network quality, one of them aspect is to realize that (User Equipment UE) switches between different districts terminal smoothly
At global mobile communication (Global System For Mobile Communication, GSM) etc. in the wireless network, the switching of UE between different districts is by radio network controller (Radio NetworkController, RNC) control, at Long Term Evolution (Long Term Evolution, LTE) do not have RNC in the network, switching controls is finished by base station (Base Station, BS or NodeB).
Source base station managed source sub-district, target BS management objectives sub-district, UE is in the cell-of-origin at present, when the measurement report of source base station according to UE and source base station, UE is when Target cell switches in decision, can directly carry out information exchange by X2 interface and target BS, finishes the resource of Target cell and prepares; Sending out switching command notice UE afterwards switches toward Target cell; Behind handover success, the Radio Resource of source of release sub-district, target BS notification source base station.In addition, source base station need send the data that do not send as yet to target BS, and upgrades the node relationships of user plane and control plane.
From the switching flow of foregoing description, in order to guarantee success rate for switching, in time notifying UE to initiate to switch reliably is an important factors.The method that several raising switching commands send reliability has been discussed, the suggestion of not reaching an agreement in the motion of LTE.Texas Instrument is in the R2-075066 that 60 RAN2 meetings of 3gpp are carried, propose to send in two steps the method for switching command, the main thought of this motion is after source base station is finished handover decisions, when target BS sends handoff request, send the more existing handover informations of a part of source base station to UE, after the switching of receiving target BS is confirmed, send uncompleted switching command to UE with the Modulation and Coding Scheme of low order.But do not specifically note the message content that per step sends in this motion.
In traditional 3G handoff procedure, source base station sends to the whole message of the switching command of UE and all confirms content from the switching that target BS returns.The base station of LTE also is based on this hypothesis in handoff procedure at present, that is to say, source base station must send switching command to target BS earlier, confirms could obtain handover information after the content in the switching that target BS returns.The above-mentioned scheme that sends switching command does not in two steps propose the particular content of the handover information of first step transmission, do not point out how to obtain these information yet, therefore obtain the mode of handover information according to the base station of present LTE, technique scheme is not an exercisable technical scheme.
Summary of the invention
The purpose of the embodiment of the invention is to provide the sending method and the base station of switching command, realizes two steps transmission switching command, guarantees that switching command in time, reliably and intactly sends to terminal.
The embodiment of the invention provides a kind of sending method of switching command, is applied in the long evolving system, and this method comprises:
Source base station sends to terminal with first handover information, and described first handover information is the target BS information that period of change surpasses preset value;
Need initiate to switch when the described terminal of affirmation, described source base station sends switching command to described target BS;
Described source base station receives the handoff response that described target BS returns, and according to the handoff response of described target BS, second handover information is sent to described terminal, and described second handover information is the target BS information of period of change smaller or equal to preset value.
The embodiment of the invention also provides a kind of base station, is arranged in the long evolving system, it is characterized in that, comprising:
Memory cell is used to store first handover information, and described first handover information is the target BS information that period of change surpasses preset value;
Change-over command unit is used for sending switching command when knowing that described terminal need initiate to switch to described target BS;
Receiving element is used for receiving the handoff response from described target BS after described change-over command unit sends switching command;
Transmitting element, be used for first handover information of described cell stores is sent to terminal, and the handoff response that receives according to described receiving element, second handover information is sent to described terminal, wherein, described second handover information is the target BS information of period of change smaller or equal to preset value.
Adopt the technical scheme of the embodiment of the invention, the content of clear and definite first handover information and second handover information, make in the LTE system, the method that sends handover information in two steps becomes exercisable technical scheme, perfect this method guarantees that handover information can in time, reliably, intactly pass to terminal.
Description of drawings
Figure 1 shows that the schematic flow sheet of the method that switching command sends in the embodiment of the invention one;
Figure 2 shows that terminal handoff scenario between HNodeB and macrocell;
Figure 3 shows that terminal is in the minizone at two ends, tunnel handoff scenario;
Figure 4 shows that the structural representation of base station in the embodiment of the invention two.
Embodiment
Below the present invention is described in detail.
At first the base station is divided into two big classes to the switching command message content that terminal sends, wherein a class is the lower information of change frequency, such as the configuration information of uplink downlink, uplink downlink bandwidth, random access parameter (such as: random sequence form, root sequence index, zero correlation block length of field, at a high speed sign, insert transmitted power setting, cell ID at random) etc., these information are reshuffled preceding in the base station or the base station can not change before restarting, i.e. the period of change interval of reshuffling or restarting greater than the base station; Perhaps other may change before the base station is reshuffled or restarted but period of change surpasses the information of preset value (for example a minute), and the information that these change frequencies are lower is called first handover information hereinafter.Another kind of is the high relatively information of change frequency, such as Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI Cell Radio Network TemporaryIdentifier, C-RNTI), the running time-frequency resource configuration that inserts at random, insert dedicated sequences etc. at random and change information faster, be the information of period of change smaller or equal to preset value (for example one minute), the higher information of these change frequencies is called second handover information hereinafter.The preset value of period of change can be set to not wait to several hrs in tens seconds according to the difference of the average user quantity of sub-district.Number of users is preset value low (being that the cycle is short) at most, and quantity is the preset value height at least.
, can be included in this two category information respectively in two containers respectively when source base station sends the switching affirmation at target BS, the container that comprises first handover information has version information, perhaps can also comprise this version information ground effective time limit.
Can obtain by following two kinds of methods for the first handover information source base station:
1) first or last time source base station and the handed over service process of target BS in, when source base station is received the switch acknowledgment message of target BS,, then first handover information is saved in this locality if there is the container that comprises first handover information in the switch acknowledgment message.
2) after target BS is reshuffled or is restarted, target BS judges whether first handover information upgrades, if first handover information upgrades, then target BS initiatively sends first handover information after the renewal and redaction information to adjacent base station (comprising source base station), source base station is received the legacy version information of back with the local target BS of preserving of redaction information updating, and replaces former first handover information of the local target BS of preserving with first handover information that upgrades.
Figure 1 shows that the schematic flow sheet of the method that switching command sends in the embodiment of the invention one.
The detailed process of the technical program is as follows:
Step 1a, source base station is made handover decisions according to measurement report, confirms that terminal need initiate to switch, and source base station is checked first handover information that whether has the target BS that terminal will switch.If this source base station has this first handover information, source base station sends above-mentioned first handover information that source base station is preserved when target BS sends handoff request to terminal so.
Step 1b when target BS sends handoff request, comprises the version number of target BS first handover information of source base station preservation at source base station in the handoff request, target BS checks whether this first handover information is invalid after receiving this handoff request.
Step 2, if having renewal in first handover information, target BS will comprise the container that carries the first new handover information when sending the switching affirmation to source base station so.Otherwise switch acknowledgment message only need comprise second handover information.
Step 3, source base station receive that the first new handover information preserves.If source base station has been received the first new handover information, it will resend the first new handover information and second and handover information to terminal so.
Wherein, step 1a and the step 1b transmission that can walk abreast.Step 1a can adopt high-rise affirmation mechanism, reaches higher reliability.Step 3 can adopt low-order-modulated and mixed automatic retransmission request, and (HybridAutomatic Repeat Request, HARQ) scheme guarantees reliability.
On user plane, loss of data in switch, after switching flow on signaling is finished, target BS will be notified mobile management entity/user entity (Mobility Management Entity, MME/User Plane Entity UPE) transfers to target BS to the user plane path of base station from source base station with gateway.Simultaneously source base station successively own between transfer period, receive to the user face tunnel of user's data bag by X2 interface, be transmitted to target BS.
In addition, step 1a can also advance to handover decisions and carried out in the past.Has certain meaning in some special screne following times of clearly having known handover-target base station.(HomeNodeB, HNodeB) scene: network has been known and HNodeB portable terminal certain macrocell that is bound to such as following base station from home.When specifically advance to, can set another one thresholding (can trigger, also can by the measurement of base station side) for this reason in base station side to self by the measurement report content of UE.Promptly before not reaching switching standards, may reach and trigger the thresholding of early sending out HANDOVER INFO message.This reliability that raising switching command is issued also can be helpful.
The HNodeB application scenarios is given an example:
Scene one Figure 2 shows that terminal handoff scenario between HNodeB and macrocell.
In this scene, source base station is HNodeB, and target BS is the base station that covers macrocell, because the macrocell adjacent with HNodeB is less, so terminal is in affiliated subdistrict and the macrocell basic fixed of HNodeB.Daily mutual or last time mutual switch mutual in, the other side's first handover information that sends in advance can be preserved in these two base stations.When HNodeB determined switching terminal to target BS, it sent first handover information in advance to terminal, and terminal can be done some switching preparations, and when terminal was received second handover information, terminal began execution and switches to target BS.
Scene two Figure 3 shows that terminal is in the minizone at two ends, tunnel handoff scenario.
In this scene, source base station and target BS are respectively the base stations that covers the sub-district at two ends, tunnel, fix in the sub-district at two ends, tunnel, so the other side's first handover information that sends in advance can be preserved in two base stations.When terminal switched at the two ends, tunnel, in case decision is switched, source base station can send first handover information of target BS in advance to terminal.When sending a handover request to target BS, this handoff request comprises the version information of first handover information.Receive that when source base station the switching of target BS confirms, detect first handover information whether redaction is arranged, have new edition information then to be updated to this locality, issue the switching response message received simultaneously to terminal.
Scene three is switched between macrocell.Except above-mentioned two scenes, the switching cell that terminal takes place at macrocell may be unfixing relatively.Whether in advance source base station can send this category information according to ageing setting that sends first handover information in advance of target BS.If the switch acknowledgment message that target BS sends does not provide this category information, source base station makes up local handover information of preserving and the content of receiving the handover information acknowledge message of target BS so, send to terminal, and reset the effective time limit of the local handover information of preserving.
In the above technical scheme, by dividing the content of handover information, be used to base station under some neighbor cells notify terminal content that switch, that change frequency is lower, promptly first handover information is kept at source base station, in case source base station is made handover decisions, first handover information of finding target BS has preservation at source base station, can send this part handover information so in advance to terminal, is convenient to terminal and does handover preparation work in advance.Simultaneously, on the one hand, the part handover information is sent in advance, can win the more multiple time of sending for second handover information; On the other hand, reduced the content of second handover information, thus increase by second handover information Modulation and Coding Scheme (Modulation and Coding Scheme, MCS); Again on the one hand, can adopt high-rise affirmation mechanism to guarantee the reliability of first handover information, so both guaranteed the reliability that signaling sends, do not bring time-delay again, expense other schemes (sending the hand off signaling that is not split simultaneously such as sending the hand off signaling or a plurality of HARQ process that are not split with low order MCS) that improve reliability relatively is also less.In addition, send at second handover information under the situation of failure, the Target cell that terminal can will be switched according to the first handover information analysis of receiving avoids terminal to select one not through switching the sub-district of preparing, and causes handoff failure.
Figure 4 shows that the structural representation of base station in the embodiment of the invention two.
A kind of base station is arranged in the long evolving system, is used to send switching command, comprising:
Change-over command unit 402 is used for sending switching command when confirm terminal needs initiation switching according to measurement report to target BS;
Receiving element 403 is used for receiving the handoff response from target BS after described change-over command unit sends switching command;
Transmitting element 404, be used for first handover information of said memory cells storage is sent to terminal, and the handoff response that receives according to described receiving element, second handover information is sent to terminal, wherein, above-mentioned second handover information is the target BS information of period of change smaller or equal to preset value.
Further, above-mentioned receiving element also is used for changing when first handover information of target BS, receives from first handover information after the renewal of described target BS;
Said memory cells, first handover information after the renewal that also is used for receiving, first handover information of updated stored according to described receiving element.
Further, above-mentioned transmitting element also comprises:
Judgment sub-unit is used to judge whether to arrive predetermined triggering thresholding;
Send subelement, be used for judging the triggering thresholding that arrival is predetermined, first handover information is sent to terminal when described judgment sub-unit.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential hardware platform, can certainly all implement, but the former is better execution mode under a lot of situation by hardware.Based on such understanding, all or part of can the embodying that technical scheme of the present invention contributes to background technology with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (22)
1, a kind of sending method of switching command is applied to it is characterized in that in the long evolving system that this method comprises:
Source base station sends to terminal with first handover information, and described first handover information is the target BS information that period of change surpasses preset value;
Need initiate to switch when the described terminal of affirmation, described source base station sends switching command to described target BS;
Described source base station receives the handoff response that described target BS returns, and according to the handoff response of described target BS, second handover information is sent to described terminal, and described second handover information is the target BS information of period of change smaller or equal to preset value.
2, method according to claim 1 is characterized in that, the target BS information that described period of change surpasses preset value comprises: immovable target BS information before source base station is reshuffled or restarted.
3, method according to claim 1 is characterized in that, the target BS information that described period of change surpasses preset value comprises: before source base station was reshuffled or restarted, period of change was greater than the target BS information of preset value.
4, method according to claim 3 is characterized in that, this method also comprises:
Set the preset value of described period of change according to the average user quantity of the sub-district that described target BS covered.
5, method according to claim 4 is characterized in that, the preset value that described average user quantity according to the sub-district that described target BS covered is set described period of change comprises:
Along with increasing of the average user quantity of the sub-district that described target BS covered, the preset value of described period of change reduces.
6, method according to claim 1 is characterized in that, described first handover information comprises: the configuration information of uplink downlink, uplink downlink bandwidth and random access parameter.
7, method according to claim 6 is characterized in that, described random access parameter comprises: random sequence form, root sequence index, zero correlation block length of field, high speed identify, insert at random transmitted power setting and cell ID.
8, method according to claim 1 is characterized in that, described second handover information comprises: the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C-RNTI that described target BS distributes.
9, method according to claim 8 is characterized in that, described second handover information also comprises: insert dedicated sequences, described effective termination time of dedicated sequences and first handover information of renewal of inserting at random at random.
10, method according to claim 1 is characterized in that, described source base station also comprises before first handover information is sent to terminal:
First or in the handed over service process of last time and described target BS, described source base station is received the switch acknowledgment message of described target BS, if comprise described first handover information in the described switch acknowledgment message, then described source base station is stored described first handover information.
11, method according to claim 1 is characterized in that, described first handover information is sent to also comprises before the terminal:
When first handover information of described target BS is changed, described source base station is received from first handover information after the renewal of described target BS, and is upgraded local first handover information of preserving.
12, method according to claim 1 is characterized in that, described source base station is after described target BS sends switching command, and this method also comprises:
Change when first handover information of described target BS, carry first handover information after described target BS upgrades in the described handoff response, described source base station upgrades local first handover information of preserving according to described handoff response.
13, method according to claim 12, it is characterized in that comprise two containers in the described handoff response, first container carries first handover information after the renewal, second container carries described second handover information, and described first container also carries the version information of first handover information after the renewal.
14, method according to claim 13 is characterized in that, described first container also carries the effective time limit of the version information of first handover information after the described renewal.
According to claim 11 or 12 described methods, it is characterized in that 15, described first handover information that upgrades local preservation comprises:
To replace legacy version information in local first handover information of preserving from the redaction information in first handover information after the renewal of described target BS, and first handover information after will upgrading is replaced first handover information of local preservation.
16, method according to claim 1 is characterized in that, described source base station also comprises before first handover information is sent to terminal:
First or in the handed over service process of last time and described target BS, when described source base station is received the switch acknowledgment message of described target BS, in described switch acknowledgment message, comprise the predetermined trigger gate that sends first handover information and prescribe a time limit, store the predetermined triggering thresholding that message is switched in described transmission first.
17, method according to claim 16 is characterized in that, describedly first handover information is sent to terminal comprises:
Prescribe a time limit when the predetermined trigger gate that arrives described transmission first handover information, first handover information is sent to terminal.
18, method according to claim 17 is characterized in that, described arrival sent the predetermined triggering thresholding of first handover information before confirming that described terminal need be initiated to switch.
19, method according to claim 17 is characterized in that, when confirming that described terminal need be initiated to switch, arrives the predetermined triggering thresholding of described transmission first handover information.
20, a kind of base station is arranged in the long evolving system, it is characterized in that, comprising:
Memory cell is used to store first handover information, and described first handover information is the target BS information that period of change surpasses preset value;
Change-over command unit is used for sending switching command when knowing that described terminal need initiate to switch to described target BS;
Receiving element is used for receiving the handoff response from described target BS after described change-over command unit sends switching command;
Transmitting element, be used for first handover information of described cell stores is sent to terminal, and the handoff response that receives according to described receiving element, second handover information is sent to described terminal, wherein, described second handover information is the target BS information of period of change smaller or equal to preset value.
21, base station according to claim 20 is characterized in that,
Described receiving element also is used for changing when first handover information of described target BS, receives from first handover information after the renewal of described target BS;
Described memory cell, first handover information after the renewal that also is used for receiving, first handover information of updated stored according to described receiving element.
22, base station according to claim 20 is characterized in that, described transmitting element comprises:
Judgment sub-unit is used to judge whether to arrive the predetermined triggering thresholding that sends the first switching message;
Send subelement, be used for judging arrival transmission first and switch the predetermined triggering thresholding of message, first handover information is sent to terminal when described judgment sub-unit.
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| CNA2008100023154A CN101483892A (en) | 2008-01-08 | 2008-01-08 | Switching command sending method and base station |
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| CN102239720A (en) * | 2009-08-14 | 2011-11-09 | 华为技术有限公司 | Control method for data processing, service node and terminal equipment |
| CN102281601A (en) * | 2010-06-09 | 2011-12-14 | 华为技术有限公司 | Method, equipment and system for carrying out handover processing between cells |
| CN102960023A (en) * | 2010-06-25 | 2013-03-06 | 株式会社Ntt都科摩 | Base station and method |
| CN103096255A (en) * | 2013-01-11 | 2013-05-08 | 大唐移动通信设备有限公司 | Broadcast news sending method and base station |
| WO2013086677A1 (en) * | 2011-12-12 | 2013-06-20 | 华为技术有限公司 | Communication method, base station and user equipment |
| WO2014190474A1 (en) * | 2013-05-27 | 2014-12-04 | 华为技术有限公司 | Mobility management method, device and system |
| CN104509161A (en) * | 2012-08-07 | 2015-04-08 | 华为技术有限公司 | Handover processing method and eNB |
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| CN102239720A (en) * | 2009-08-14 | 2011-11-09 | 华为技术有限公司 | Control method for data processing, service node and terminal equipment |
| CN102281601A (en) * | 2010-06-09 | 2011-12-14 | 华为技术有限公司 | Method, equipment and system for carrying out handover processing between cells |
| CN102281601B (en) * | 2010-06-09 | 2014-12-31 | 华为技术有限公司 | Method, equipment and system for carrying out handover processing between cells |
| CN102960023B (en) * | 2010-06-25 | 2015-07-01 | 株式会社Ntt都科摩 | Base station and method |
| CN102960023A (en) * | 2010-06-25 | 2013-03-06 | 株式会社Ntt都科摩 | Base station and method |
| WO2013086677A1 (en) * | 2011-12-12 | 2013-06-20 | 华为技术有限公司 | Communication method, base station and user equipment |
| CN103493539A (en) * | 2011-12-12 | 2014-01-01 | 华为技术有限公司 | Communication method, base station and user equipment |
| CN103493539B (en) * | 2011-12-12 | 2017-10-24 | 华为技术有限公司 | Communication means, base station and user equipment |
| US10015702B2 (en) | 2012-08-07 | 2018-07-03 | Huawei Technologies Co., Ltd. | Handover processing method and base station |
| CN104509161A (en) * | 2012-08-07 | 2015-04-08 | 华为技术有限公司 | Handover processing method and eNB |
| US10736001B2 (en) | 2012-08-07 | 2020-08-04 | Huawei Technologies Co., Ltd. | Handover processing method and base station |
| US10334486B2 (en) | 2012-08-07 | 2019-06-25 | Huawei Technologies Co., Ltd. | Handover processing method and base station |
| CN104509161B (en) * | 2012-08-07 | 2018-11-16 | 华为技术有限公司 | Switching handling method and base station |
| CN103096255A (en) * | 2013-01-11 | 2013-05-08 | 大唐移动通信设备有限公司 | Broadcast news sending method and base station |
| CN103096255B (en) * | 2013-01-11 | 2016-05-11 | 大唐移动通信设备有限公司 | A kind of broadcast message sending method and a kind of base station |
| CN104854908B (en) * | 2013-05-27 | 2018-05-29 | 华为技术有限公司 | Motion management method, equipment and system |
| WO2014190474A1 (en) * | 2013-05-27 | 2014-12-04 | 华为技术有限公司 | Mobility management method, device and system |
| EP2991401A4 (en) * | 2013-05-27 | 2016-04-20 | Huawei Tech Co Ltd | Mobility management method, device and system |
| CN104854908A (en) * | 2013-05-27 | 2015-08-19 | 华为技术有限公司 | Mobility management method, device and system |
| CN110637285A (en) * | 2017-04-11 | 2019-12-31 | 高通股份有限公司 | Advanced pass-through mechanism for low power sequencers |
| CN110913498A (en) * | 2018-09-18 | 2020-03-24 | 维沃移动通信有限公司 | Random access method and terminal |
| CN110913498B (en) * | 2018-09-18 | 2021-07-06 | 维沃移动通信有限公司 | Random access method and terminal |
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