CN101562848A - Method and device for reselecting carrier frequency - Google Patents
Method and device for reselecting carrier frequency Download PDFInfo
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- CN101562848A CN101562848A CNA2008100665902A CN200810066590A CN101562848A CN 101562848 A CN101562848 A CN 101562848A CN A2008100665902 A CNA2008100665902 A CN A2008100665902A CN 200810066590 A CN200810066590 A CN 200810066590A CN 101562848 A CN101562848 A CN 101562848A
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Abstract
The invention discloses a method for reselecting carrier frequency, comprising the following steps: UE is resided in a first carrier frequency which has the topmost priority in the dedicated priority list of UE, and the UE transmits RRC connection requesting message to a base station; the UE receives RRC connection refusing message sent by the base station and including parameters for reselecting carrier frequency; and the UE reselects carrier frequency according to the parameters for reselecting carrier frequency. The invention also discloses a user device which comprises a transmitting unit, a receiving unit, a storing unit and a processing unit. The method and device provided by the invention ensures that the UE obtains better service and improves the user experience.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of method and apparatus of reselecting carrier frequency.
Background technology
Long Term Evolution (Long Term Evolution, LTE) network is the next generation wireless communication standard that 3GPP formulates, for cell selecting or reuse adoption process, LTE has introduced the notion of priority, (User Equipment UE) carries out reselecting carrier frequency between alien frequencies or different system based on priority list to subscriber equipment.Priority can be divided into public priority and dedicated priority, public priority list is issued UE by system message broadcasting, all UE in sub-district use identical public priority, the dedicated priority tabulation is by dedicated radio resources control (Radio Resource Control, RRC) signaling is issued UE, after UE received dedicated priority, UE was as the criterion with dedicated priority.The factor of determining the dedicated priority tabulation of UE has: the historical call record of the ability of UE, UE, user signing contract information, network load condition etc., wherein parameters such as the ability of UE, historical call record and user signing contract information need be by mobile management entity (Mobile Management Entity, MME) send to the base station, the base station generates the UE dedicated priority in conjunction with these parameters and the loading condition of itself, be that the base station will generate the dedicated priority tabulation, must set up S1 with MME and be connected.
When UE reside in one be not have the carrier frequency of limit priority on the time, no matter the signal quality of Serving cell how, UE periodically searches for the frequency of limit priority, and when UE resides in the carrier frequency of limit priority, have only the measurement that after the signal of this carrier cell is lower than certain thresholding, just can start to other low priority carrier frequency.
In LTE, if the resident carrier frequency that has limit priority in the dedicated priority tabulation of UE transships, then there are the following problems: receive the RRC connection request message of UE transmission in the base station after, determine to allow this UE insert according to load condition, send the RRC connection refused message to this UE, this moment the base station also not and MME connect, the base station can't obtain the required parameter of dedicated priority tabulation that generates UE, therefore can't carry new dedicated priority tabulation in the RRC connection refused message, UE will use old dedicated priority tabulation.Because the tabulation of the dedicated priority of public priority list and UE is all by network control in the prior art, UE is passive to carry out reselecting carrier frequency according to priority list, so according to old dedicated priority tabulation, UE resides in still on the carrier frequency of original overload not that broken hair plays calling, makes the load of original overload carrier frequency to reduce.
Base station from home in the prior art (Home NodeB, carrier frequency HNB) has limit priority in the tabulation of the dedicated priority of UE, and HNB has different carrier frequency with macrocell, and UE preferentially resides in the HNB sub-district.HNB is a volume small device, because artificial factor, the S1 interface between HNB and the MME is easy to take place the chain rupture situation, and promptly the carrier frequency of this base station is unavailable at this moment, for this situation, still tabulation resides in the HNB sub-district to UE according to dedicated priority, if the user makes a call, because the chain rupture of S1 interface, network can't be set up the corresponding call business, influence user's susceptibility, (also there is same problem in evolved NodeB to evolution base station when eNB) disconnecting with the physical connection of MME.
In the prior art when the resident carrier frequency overload that in dedicated priority tabulation, has limit priority of UE or when unavailable, UE can't carry out reselecting carrier frequency according to the dedicated priority tabulation, make when carrier frequency takes place overload, its load can not reduce, when carrier frequency is unavailable, UE can't gravity treatment to other available carrier frequency, influenced user's susceptibility.
Summary of the invention
The purpose of the embodiment of the invention provides a kind of method of reselecting carrier frequency, solves in the prior art in the network when the resident carrier frequency that has limit priority in the dedicated priority tabulation of UE transships or be unavailable, and UE can't carry out the problem of reselecting carrier frequency.
In view of this, the embodiment of the invention provides a kind of method of reselecting carrier frequency, UE resides in first carrier frequency, and described first carrier frequency has the limit priority in the dedicated priority tabulation of UE, and this method comprises: described UE sends radio resource control RRC connection request message to the base station; When described UE receives the RRC connection refused message that described base station sends, when described RRC connection refused message comprises the parameter that is used for reselecting carrier frequency; Described UE carries out reselecting carrier frequency according to the described parameter that is used for reselecting carrier frequency.
The embodiment of the invention also provides a kind of subscriber equipment, subscriber equipment resides in first carrier frequency, described first carrier frequency has the limit priority in the dedicated priority tabulation of subscriber equipment, and this subscriber equipment comprises: transmitting element is used for sending RRC connection request message to the base station; Receiving element is used to receive the RRC connection refused message that described base station sends, and comprises the parameter that is used for reselecting carrier frequency in the described RRC connection refused message; Processing unit is used for carrying out reselecting carrier frequency according to described parameter and the priority list that is used for reselecting carrier frequency.
The method and apparatus that the embodiment of the invention provides makes when the resident limit priority carrier frequency of UE transships or be unavailable, in the RRC connection refused message that the base station sends, carry the parameter that is used for reselecting carrier frequency and make UE to carry out reselecting carrier frequency, improve user's susceptibility according to this parameter and priority list.
Description of drawings
Fig. 1 is the schematic flow sheet of one embodiment of the invention;
Fig. 2 is the schematic flow sheet of another embodiment of the present invention;
Fig. 3 is the schematic flow sheet of another embodiment of the present invention;
Fig. 4 is the structural representation of the subscriber equipment of the embodiment of the invention.
Embodiment
For the purpose that makes the embodiment of the invention, technical scheme, and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the embodiment of the invention is further described.
The method that the embodiment of the invention provides is when the resident carrier frequency with limit priority in the dedicated priority tabulation of UE takes place to transship or be unavailable, in the RRC connection refused message that the base station sends, carry the parameter that is used for reselecting carrier frequency, make UE to carry out reselecting carrier frequency according to this parameter.Base station in the embodiment of the invention is eNB or HNB.
Being illustrated in figure 1 as the method for a kind of reselecting carrier frequency that the embodiment of the invention provides, having only a carrier frequency to have limit priority in the dedicated priority tabulation of UE, when overload takes place the resident carrier frequency of UE, is that example describes with eNB, and this method comprises following flow process:
Step 101, UE send the RRC connection request to eNB;
After step 102, eNB receive RRC connection request message, determine not allow UE to insert according to loading condition, send RRC to UE and connect refusal, this message is carried Reason For Denial value (Reject Cause), expression carrier frequency congested (Congestion);
Step 103, UE reduce current resident carrier frequency corresponding priorities according to the Reason For Denial value in the RRC connection refusal, and laying equal stress on to choose in the dedicated priority tabulation has on the carrier frequency of inferior high priority.
The method that the embodiment of the invention provides can also be used for the base station at the current place of UE and the situation that the physical connection between the MME disconnects, the carrier frequency of this base station has the limit priority in the dedicated priority tabulation, just in step 202, eNB determines the disconnection that is connected with MME, and the Reason For Denial value representation that carries in the RRC connection refused message " no S1 interface connects ".
The method that the embodiment of the invention provides makes when the resident limit priority carrier frequency of UE transships, by in the RRC connection refused message, carrying the parameter that is used for reselecting carrier frequency: the Reason For Denial value, UE changes the priority of overload carrier frequency according to this Reason For Denial value, make the dedicated priority tabulation can correctly reflect the current state of network, the UE gravity treatment is to the carrier frequency with inferior priority, in time reduce the load of overload carrier frequency, perhaps when the resident base station of UE and the physical connection between the MME disconnected, UE adopted and uses the same method gravity treatment to other carrier frequency.
The method of the another kind of reselecting carrier frequency that the embodiment of the invention provides, have only a carrier frequency to have limit priority in the dedicated priority tabulation of UE, the carrier frequency with limit priority resident as UE transships, be illustrated in figure 2 as the schematic flow sheet of the embodiment of the invention, with eNB is that example describes, and this method comprises following flow process:
Step 201-202 is with step 101-102;
Public priority list in step 203, the UE frame of reference broadcast message is laid equal stress on and is chosen the carrier frequency that has limit priority in the public priority list and get on.
The method of the embodiment of the invention is applicable to that too the base station at the current place of UE and the physical connection between MME disconnect, the i.e. disabled situation of the carrier frequency of this base station, this carrier frequency has the limit priority in the dedicated priority tabulation, just in the step 202, the cause value that carries in the RRC connection refused message is represented " no S1 interface connects ".
The embodiment of the invention is by carrying the parameter that is used for reselecting carrier frequency in the RRC connection refused message: the Reason For Denial value, make that the user can be when having the carrier frequency overload of limit priority, or when unavailable, select to use public priority, lay equal stress on and choose on the carrier frequency that in public priority list, has limit priority.
Above two kinds of methods that the embodiment of the invention provides make when the resident carrier frequency overload with limit priority of UE, or the base station at place and the physical connection between MME are when disconnecting, UE can be according to the parameter that is used for reselecting carrier frequency of carrying in the RRC connection refused message: the Reason For Denial value, carry out reselecting carrier frequency, make when having the carrier frequency overload of limit priority, can in time reduce the load of this carrier frequency, perhaps when this carrier frequency is unavailable, UE can in time obtain service, improves user's susceptibility.
Be illustrated in figure 3 as the method for a kind of reselecting carrier frequency that the embodiment of the invention provides, there be N carrier frequency to have limit priority in the dedicated priority tabulation of UE, N 〉=2, if having the carrier frequency of limit priority, resident one of them of UE transship, with eNB is that example describes, and this method comprises following flow process:
Step 301 is with step 101;
Step 302, eNB determine not allow UE to insert according to loading condition, send the RRC connection refused message to UE, and this message is carried a side-play amount (Offset), and this side-play amount is used to have the gravity treatment between the carrier frequency of equal priority;
Step 303, UE carry out reselecting carrier frequency according to the side-play amount in the RRC connection refused message, and method one, UE are lighter to other loads according to the side-play amount gravity treatment that RRC connects in the refusal, and have on the carrier frequency of limit priority; Method two, UE connect side-play amount in the refusal with RRC and add that cell specific offset amount (Cell Specific Offset) obtains new side-play amount, and lighter to other loads according to this new side-play amount gravity treatment, and have on the carrier frequency of limit priority.
Base station and the physical connection between MME that the method for the embodiment of the invention is equally applicable to the current place of UE disconnect, the i.e. disabled situation of the carrier frequency of this base station, this carrier frequency has the limit priority in the dedicated priority tabulation, at this moment, UE has to other on carrier frequency of limit priority according to said method one or method two gravity treatment.
The embodiment of the invention is by carrying the parameter that is used for reselecting carrier frequency in the RRC connection refused message: side-play amount, make UE after resident limit priority carrier frequency overload, other have in the load of limit priority according to the side-play amount gravity treatment, thereby in time alleviated the load of overload carrier frequency, perhaps when this carrier frequency is unavailable, UE gravity treatment is in time in time obtained service to other available carrier frequency, improve user's susceptibility.
The embodiment of the invention also provides a kind of subscriber equipment, as shown in Figure 4, when the resident carrier frequency that has limit priority in the dedicated priority tabulation of subscriber equipment took place to transship or be unavailable, this subscriber equipment comprised: transmitting element, receiving element, memory cell and processing unit, wherein
Transmitting element is used for sending RRC connection request message to the base station;
Receiving element is used to receive the RRC connection refused message that the base station sends, and this RRC connection refused message is carried the parameter that is used for reselecting carrier frequency, and this parameter includes but not limited to Reason For Denial value, side-play amount;
Memory cell is used to store the dedicated priority tabulation, can also be used to store public priority list.
Processing unit is used for carrying out reselecting carrier frequency according to the parameter that is used for reselecting carrier frequency of RRC connection refused message, concrete, in the dedicated priority tabulation of UE, have only a carrier frequency to have limit priority, and when above-mentioned parameter is the Reason For Denial value, reduce the priority of first carrier frequency that overload takes place, gravity treatment is to having on second carrier frequency of inferior priority in the dedicated priority tabulation, perhaps, with reference to public priority list, gravity treatment is to the 3rd carrier frequency that has limit priority in public priority list; If have N carrier frequency to have limit priority in the tabulation of the dedicated priority of UE, N 〉=2, and above-mentioned parameter is a side-play amount, then according to this side-play amount gravity treatment to four carrier, perhaps can also be with this side-play amount and the addition of cell specific offset amount, obtain new side-play amount, and according on these new side-play amount gravity treatment to the five carrier frequency, above-mentioned four carrier and the 5th carrier frequency all has the limit priority in the dedicated priority tabulation.
The subscriber equipment that the embodiment of the invention provides can carry out reselecting carrier frequency according to the parameter that is used for reselecting carrier frequency that this message is carried after receiving the RRC connection refused message, as reduce the overload carrier frequency priority, perhaps with reference to public priority list, perhaps carry out reselecting carrier frequency according to side-play amount, thereby when having the carrier frequency overload of limit priority, can in time reduce the load of overload carrier frequency, when carrier frequency is unavailable, subscriber equipment can in time be selected on other available carrier frequency, obtain service, thereby improve user's susceptibility.
The method and apparatus that the embodiment of the invention provides is equally applicable to other and utilizes priority list to carry out the system of cell selecting or gravity treatment.
More than the method and the device of a kind of reselecting carrier frequency that the embodiment of the invention provided is described in detail, the explanation of above embodiment just is used to help to understand the method and the thought thereof of the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the thought of the embodiment of the invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as the restriction to the embodiment of the invention.
Claims (10)
1, a kind of method of reselecting carrier frequency is characterized in that, UE resides in first carrier frequency, and described first carrier frequency has the limit priority in the dedicated priority tabulation of UE, and described method comprises:
User equipment (UE) sends radio resource control RRC connection request message to the base station;
When described UE receives the RRC connection refused message that described base station sends, when described RRC connection refused message comprises the parameter that is used for reselecting carrier frequency;
Described UE carries out reselecting carrier frequency according to described parameter and the priority list that is used for reselecting carrier frequency.
2, the method for claim 1, it is characterized in that, when described first carrier frequency overload, or unavailable, and described first carrier frequency is in the tabulation of described dedicated priority during unique carrier frequency with limit priority, and the described parameter that is used for reselecting carrier frequency is the Reason For Denial value.
3, method as claimed in claim 2 is characterized in that, the method that described UE carries out reselecting carrier frequency is specially:
Described UE reduces the priority of described first carrier frequency, lays equal stress on and chooses on second carrier frequency, and described second carrier frequency has the inferior priority in the described dedicated priority tabulation;
Perhaps,
On described UE gravity treatment to the three carrier frequency, described the 3rd carrier frequency has the limit priority in the public priority list.
4, the method for claim 1 is characterized in that, described first carrier frequency overload, or unavailable, and when at least two carrier frequency had limit priority in the tabulation of described dedicated priority, the described parameter that is used for reselecting carrier frequency was a side-play amount;
Described UE is according on described side-play amount gravity treatment another carrier frequency outside described first carrier frequency, and described another carrier frequency has the limit priority in the described dedicated priority tabulation.
5, method as claimed in claim 4 is characterized in that, described UE is specially according to the method for another carrier frequency of described side-play amount gravity treatment outside described first carrier frequency:
Described UE obtains new side-play amount with described side-play amount and the addition of cell specific offset amount, and according to described new side-play amount gravity treatment to four carrier.
6, as any described method of claim among the claim 1-6, it is characterized in that described base station is evolution base station eNB or Home node base station HNB.
7, a kind of subscriber equipment is characterized in that, subscriber equipment resides in first carrier frequency, described first carrier frequency has the limit priority in the dedicated priority tabulation of subscriber equipment, described subscriber equipment comprises transmitting element, receiving element, memory cell and processing unit, wherein
Transmitting element is used for sending RRC connection request message to the base station;
Receiving element is used to receive the RRC connection refused message that described base station sends, and described RRC connection refused message comprises the parameter that is used for reselecting carrier frequency;
Memory cell is used to preserve the dedicated priority tabulation;
Processing unit is used for carrying out reselecting carrier frequency according to described parameter and the priority list that is used for reselecting carrier frequency.
8, subscriber equipment as claimed in claim 7 is characterized in that, when described first carrier frequency overload, or it is unavailable, and described first carrier frequency is in the tabulation of described dedicated priority during unique carrier frequency with limit priority, and the described parameter that is used for reselecting carrier frequency is the Reason For Denial value
Described memory cell also is used to store public priority list;
Described processing unit is used for reducing the priority of described first carrier frequency in described dedicated priority tabulation, and on gravity treatment second carrier frequency, described second carrier frequency has the inferior priority in the described dedicated priority tabulation;
Perhaps,
Described processing unit is used for gravity treatment to the three carrier frequency, and described the 3rd carrier frequency has the limit priority in the described public priority list.
9, subscriber equipment as claimed in claim 7 is characterized in that, described first carrier frequency overload, or unavailable, and when at least two carrier frequency had limit priority in the tabulation of described dedicated priority, the described parameter that is used for reselecting carrier frequency was a side-play amount,
Described processing unit is used for according to another carrier frequency outside described first carrier frequency of described side-play amount gravity treatment, and described another carrier frequency has the limit priority in the described dedicated priority tabulation.
10, subscriber equipment as claimed in claim 9, it is characterized in that, described processing unit is further used for described side-play amount and the addition of cell specific offset amount, obtain new side-play amount, and according to described new side-play amount gravity treatment to four carrier, described four carrier has the limit priority in the tabulation of described dedicated priority.
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| CN2008100665902A CN101562848B (en) | 2008-04-18 | 2008-04-18 | Method and device for reselecting carrier frequency |
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| CN2008100665902A CN101562848B (en) | 2008-04-18 | 2008-04-18 | Method and device for reselecting carrier frequency |
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Application publication date: 20091021 Assignee: Apple Computer, Inc. Assignor: Huawei Technologies Co., Ltd. Contract record no.: 2015990000755 Denomination of invention: Method and device for reselecting carrier frequency Granted publication date: 20111005 License type: Common License Record date: 20150827 |
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