CN103501519A

CN103501519A - Method to select cell in hierarchical cellular structure based on cell quality

Info

Publication number: CN103501519A
Application number: CN201310424770.4A
Authority: CN
Inventors: 千成德; 李承俊; 朴成埈; 李英大
Original assignee: LG Electronics Inc
Current assignee: LG Electronics Inc
Priority date: 2008-03-17
Filing date: 2009-03-13
Publication date: 2014-01-08
Anticipated expiration: 2029-03-13
Also published as: KR20090099474A; JP5688007B2; JP2011515941A; CN101978743B; ATE556557T1; CN103501519B; RU2450488C1; CN101978743A; KR100944093B1

Abstract

Method to select cell in hierarchical cellular structure based on cell quality. The method comprises the steps of: performing measurement of the cell; determining whether a hierarchical cellular structure (HCS) is used in the service cell; if the HCS is used in the service cell, rating is performed for the measured cells meeting a first standard and a second standard; and performing cell reselection for the optimal cell in the rating of the measured cells meeting the first standard and the second standard, wherein the first standard is used for selecting the measured cell meeting the lowest quality condition, and the second standard is used for determining whether to use a rating with priority according to a hierarchical cell reselection rule.

Description

The cell selecting method based on cell quality in layered cell structure

The application is the application for a patent for invention (international application no: PCT/KR2009/001269 that the original bill application number is 200980109356.6, the applying date: on March 13rd, 2009, denomination of invention: the dividing an application cell selecting method based on cell quality in layered cell structure).

Technical field

The present invention relates to the cell selecting method based on cell quality in layered cell structure (hierarchical cell structure).

Background technology

In the prior art, carry out community and select, still, Radio Resource is wasted in vain.Like this, prior art could not address this problem effectively, and therefore suitable solution is not provided.

Summary of the invention

The result of being tested as the situation for service (out-of-service) can not be provided, the inventor recognizes at least the problems referred to above and the shortcoming existed in prior art.Based on this understanding, to have conceived following various feature, thereby a kind of cell selecting method based on cell quality in layered cell structure is provided, this can more effectively utilize Radio Resource.

The accompanying drawing explanation

Fig. 1 shows the exemplary network structure of universal mobile telecommunications system (UMTS).

Fig. 2 shows the example wireless protocol stack used in UMTS.

Fig. 3 shows and has defined mobile terminal for selecting signal strength signal intensity and quality than the exemplary formula of the condition of the defined particular value Gao of system community.

Fig. 4 shows the flow chart of the method for the exemplary cell selection (gravity treatment) in WCDMA.

Fig. 5 shows and calculates the formula of mobile terminal for the value of the R criterion of (ranking) processing of being defined the level in minizone.

Fig. 6 shows the concept of example hierarchical cell structure (HCS).

Fig. 7 shows the example calculation process of the value of H criterion.

Embodiment

Explain according to long evolving system or other so-called 4G communication system inventive concept and the feature that relates to the cell selecting method based on cell quality in layered cell structure herein.But these details are not the restriction to above-mentioned feature, above-mentioned feature can be applicable to movement and/or wireless communication system and the method for other type.

Below, term " mobile terminal " will be used for meaning various types of subscriber equipmenies, such as the miscellaneous equipment of mobile communication terminal, subscriber equipment (UE), mobile device (ME) and all kinds of wireless communication technologys of support.

Select to refer to the suitably process of (candidate) community of mobile terminal to search in mobile communication Zhong， community.While when the result of selecting as community, selecting the Liao Yige community, selected community is called " persistent district (camped-on cell) ".When residing in the Yi Ge community, mobile terminal should be searched for the Geng You community regularly according to various cell reselection criterions (introducing after a while), and, if find the Geng You community, select the Gai Gengyou community.

Usually a large amount of users can not be supported in ， compare great community (for example, macrocell), but can support the user of high-speed mobile.Usually, for example, can support a large amount of users than small-cell (, Microcell or picocell), but can not support the user of high-speed mobile.These problems can solve by utilizing layered cell structure (HCS), and wherein HCS has defined a plurality of overlapping community of the different size that has formed a plurality of cell layer.Such cell structure makes network can effectively utilize geographic area and serves more user.

Should be positioned at which cell layer of HCS in order to limit UE, define HCS priority (HCS_PRIO).This precedence information can be used as the part of cell broadcast information (for example, SIB11 and SIB12 are for neighbor cell, and SIB13 and SIB14 are for Serving cell) and sends.For neighbor cell, this precedence information can also be measured the part of control message and send as RRC.Specify from 0 to 7 priority for the HCS community, wherein, the 0th, lowest priority and 7 are limit priorities.Can specify limit priority for the community near Serving cell.

(the cell reselection criterion can comprise the H criterion, the HCS criterion, use this HCS criterion when adopting HCS, its be based on that the information that sends in system information the measured value in the CPICH/P-CPCCH based on according to candidate cell calculate on the occasion of or negative value), the S criterion (, the selection criterion or washability (eligibility) criterion that for the quality of reception to candidate cell, whether are enough checked) and R criterion (that is, the deciding grade and level criterion of mobile terminal for the cell list that meets the S criterion is defined the level).

Conception the present invention selects (gravity treatment) process to improve community, makes it possible to reduce the appearance of the situation that service can not be provided.The situation of so-called " service can not be provided " refers to that mobile terminal can not receive specific transactions from mobile communications network due to a variety of causes.In order to tackle the situation that service can not be provided, mobile terminal need to be carried out comprehensive cell search process, the delay that this process has consumed battery electric power and caused the user to aware.

Community selects the process of (gravity treatment) to adopt the various conditions that comprise H criterion and S criterion.The inventor recognizes that there are some shortcomings in community selection (gravity treatment) process of prior art.This is because prior art is mainly considered the H criterion, then considers that the S criterion is as subsidiary conditions, or even ignores the S criterion.Understanding based on to this problem, the present invention compares the H criterion and more emphasizes and pay attention to the S criterion, and this can improve community and select and gravity treatment.

The present invention relates in the UMTS(Universal Mobile Telecommunication System as European type I MT-2000 system, universal mobile telecommunications system) the middle method of selecting mobile terminal will receive the community of business.Particularly, the present invention relates to the method for the quality of each community of mobile terminal consider a plurality of communities when the specific cell of selecting it will receive business in.

Fig. 1 shows the network configuration of universal mobile telecommunications system (UMTS) 100.The UMTS system consists essentially of subscriber equipment (UE) 130, UMTS Terrestrial radio access network (UTRAN) 120 and core net (CN) 110.UTRAN120 comprises one or more RNS (RNS) 122, and each RNS comprises radio network controller (RNC) 124 and one or more Node B126 managed by RNC124.Can there is one or more community 128 in a Node B.

Fig. 2 shows the radio protocol stack for UMTS.These radio protocol layers exist in couples in terminal and UTRAN, and carry out the deal with data transmission by wave point.Radio protocol stack roughly is divided into three layers: L1(layer 1), L2(layer 2) and L3(layer 3).

L1(layer 1) comprise physical layer (PHY), it is by various Radio Transmission Technologys, send data via wave point.The PHY layer is connected to upper strata (MAC layer) via transmission channel, and wherein transmission channel can be divided into dedicated transmission channel and Common transport channel.

L2(layer 2) comprise 4 sublayer: MAC, RLC, PDCP and BMC, below, will more specifically introduce each layer.

The MAC(medium access control) layer is carried out the mapping from various logical channels to various transmission channels, and the logic channel of carrying out from a plurality of logic channels to single transmission channel is multiplexing.The MAC layer is connected to upper strata (rlc layer) via one or more logic channels.According to the type of sent information, logic channel is divided into to the control channel that sends chain of command information and the Traffic Channel that sends user plane information.According to the type of the transmission channel that will manage, the MAC layer can be divided into to MAC-b sublayer, MAC-c/sh sublayer, MAC-d sublayer, MAC-hs sublayer and MAC-e sublayer.The management of MAC-b sublayer is for the broadcast channel (BCH) of broadcast system information.Transmission channel is shared in the management of MAC-c/sh sublayer, such as FACH(Forward Access CHannel, forward access channel) or DSCH(Downlink Shared CHannel, DSCH Downlink Shared Channel), these shared transmission channels are shared by a plurality of terminals.Dedicated transmission channel is managed for specific mobile terminal in the MAC-d sublayer, such as DCH(Downlink Shared CHannel, DSCH Downlink Shared Channel).In order in down link and up link, to support high speed data transfer, MAC-hs sublayer management HS-DSCH(High Speed Downlink Shared CHannel, high speed descending sharing channel), this high speed descending sharing channel is for sending the transmission channel of high-speed down data.MAC-e sublayer management E-DCH(Enhanced Dedicated CHannel, enhancement type special channel), this enhancement type special channel is the transmission channel for the high speed uplink transfer of data.

RLC(Radio Link Control, Radio Resource is controlled) layer is for guaranteeing each radio bearer (RB) and the desired service quality of transfer of data (Quality of service, QoS).In order to make RLC to guarantee unique QoS for RB, each RB has one or two independently RLC entity, and, rlc layer provides three kinds of operational modes, that is, and and TM(Transparent Mode, transparent mode), UM(Unacknowledged Mode, affirmation mode not) and AM(Acknowledged Mode, affirmation mode), to support various QoS.In addition, RLC is adjusted the data size so that these data are suitable for being sent by wireless (in the air) interface by lower floor, and the data that receive from upper strata are carried out to segmentation and series connection.

PDCP(Packet Data Convergence Protocol, PDCP) layer is positioned on rlc layer, and makes it possible to wireless (in the air) interface less via bandwidth according to effective mode and utilize IP grouping (such as IPv4 or IPv6) transmission data.For this reason, the PDCP layer is carried out header compression function, and it allows only to send necessary data at the header portion of data, thereby improves the efficiency of transmission between wireless (in the air) interface.Because header compression function is basic function, so the PCDP layer exists only in the PS(packet switching) in territory, and, there is single PDCP entity in single RB, to each PS business, to provide efficiently header compression function.

BMC(Broadcast/Multicast Control, broadcast/multi broadcast is controlled) layer is positioned on rlc layer, and the scheduling of execution and cell broadcast messages and carry out broadcast related function to the mobile terminal that is positioned at specific cell.

L3(layer 3) comprise Radio Resource control (RRC) layer that is positioned at lowest part, rrc layer only is defined in chain of command, for for the foundation of radio bearer, re-establish and discharge the parameter of layer 1 and layers 2 is controlled, and logic channel, transmission channel and physical channel are controlled.Here, RB refer to by the layer 1 of wireless protocols and layer is 2 that provide, for transmit the logical path of data between mobile terminal and UTRAN.Usually, the foundation of RB refers to following process,, the characteristic that the required radio protocol layer of specific data service and channel are provided is set that is, and then radio protocol layer and channel special parameter and method of operation separately be set.

Below will specifically introduce the process of the mobile terminal selection community in idle pulley.

Basically, selecting the reason of community is in order to register to network to receive business from base station.Here, if the intensity of the signal between mobile terminal and base station or quality descend due to the movement of mobile terminal,, in order to keep the transmission quality of data, mobile terminal reselects different communities.Below, by the characteristic of physical signalling (such as signal strength signal intensity and signal interference ratio) referred to as " characteristics of signals ".

As mentioned above, there is a kind of method of community of selecting based on characteristics of signals according to wireless environment.Based on following reason, mobile terminal also needs to use the community selection course: the information of UE ability, child user, resident load balance, business load balance etc.

Below, introduce the Method and Process of selecting community in WCDMA.

At first when mobile terminal-opening (or powering up), select PLMN and RAT with for radio communication, and, mobile terminal carries out the signal measurement process with base station in the frequency range that all can search for, then, select characteristics of signals value Qiang community in meeting whole communities of Fig. 3 condition, and access selected community.In the WCDMA system, CPICH RSCP, CPHIC Ec/N0 and carrier wave RSSI are used as to the value for above-mentioned signal measurement process.

In Fig. 3, be understandable that, mobile terminal is selected signal strength signal intensity and quality (intensity: Qrxlevmin+Pcompensation, quality: the community that Qqualmin) is greater than the defined particular value of system.Here, these values (Qrxlevmin, Pcompensation, quality: Qqualmin) notified to mobile terminal by system information (SI) by base station.Equally, mobile terminal is waited under idle pulley, to network request business (such as making a call) or from network, to receive business (calling out such as termination (terminating)).Mobile terminal in idle pulley to from current from its receive business community signal and from the signal of neighbor cell, measured, and repeat this process to reselect characteristics of signals Geng You community.

Fig. 4 shows the flow chart of the method for the exemplary cell selection (gravity treatment) in WCDMA.As shown in step S401, the mobile terminal in idle pulley, in the community that meets Fig. 3 condition, is carried out measuring process for the characteristics of signals value (Rs) of the community that receives business from it and the characteristics of signals value (Rn) of neighbor cell periodically.As shown in step S403, if satisfy condition Rn during special time (Treselection) > Rs, utilize the deciding grade and level process or process signal strength signal intensity and the quality of relatively more corresponding with Rn community.As a result, as shown in step S405, the community of selectivity characteristic value the highest (or maximum).That is to say, select to receive other community of community ratioing signal characteristic the best of business with current from it.

Utilize formula in Fig. 5 to obtain the value of Rs and Rn.Treselection is that the value to mobile terminal is notified via system information (SI) in base station, and Treselection is used for by making following restriction,, meet the special time amount that time period of community alternative condition should exceed, prevent from repeating to choose specific cell.

Fig. 5 shows and calculates the formula of mobile terminal for the value of the R criterion of the processing of defining the level in minizone.Here, Rs means the Serving cell rank, and Rn means the neighbor cell rank.Qmeas, s means the CPICH Ec/N0 value of measuring for from it, receiving the community of business, and Qmeas, n means for neighbor cell and in the CPICH Ec/N0 value of mobile terminal place measurement.In order to make the mobile terminal can be for the current service application weighted value received, adopted value Qhysts, and, value Qoffset, 0 for the community that reduces current access and will change access and deviation between the community that is linked into, perhaps, value Qoffmbms is for the community application weighted value for supporting point multipoint message traffic (such as MBMS).

Similar with the cell selecting method of WCDMA, cell selecting method based on characteristics of signals allows mobile terminal to select the Yi Cong base station, community with good signal receiving feature to receive business, makes receiver to resolve the signal sent by transmitter with minimum mistake.For the community that can select, obtain the value of R criterion, then, carry out deciding grade and level, make by this deciding grade and level and process to select (or gravity treatment) to there is the community of optimum signal characteristic.

But, in WCDMA, if need layered cell structure function (HCS), can apply HCS.

Fig. 6 shows the example for the cell structure of HCS.That is to say, a plurality of communities may reside in a zone (or area), and wherein the diameter of each community (or other yardstick) differs from one another.In Fig. 6, frequency O, N and M can be identical or different, only mean an example here.Equally, in Fig. 6, the community with priority C is the community with maximum gauge, and the community with priority A is the community with minimum diameter.

HCS described in Fig. 6 for example can be for reducing the variation caused in moving between cells with friction speed due to mobile terminal.For example, supposing in Fig. 6 has from right to left mobile mobile terminal A and mobile terminal B, and mobile terminal A moves with 5km/h and mobile terminal B moves with 50km/h.If two mobile terminals are all selected the community of priority A, should be understood that, in the preset time section mobile terminal B more the frequency of changing district should be 10 times of mobile terminal A.When mobile terminal needs frequently more changing district, owing to frequently carrying out cell update, power consumption and Radio Resource have been wasted.Therefore, in this case, (base station makes community that mobile terminal at a high speed selects priority C, diameter compare great community), and the mobile terminal that makes low speed is selected priority A community (that is, diameter compare little community), this makes mobile terminal more effectively to work.

In these cases, when using the HCS characteristic, the action need of mobile terminal changes.Fig. 7 shows the computational process of the value of H criterion.Therefore, the process of selecting when use HCSShi， community is as follows:

1., if HCS is being used in the current service cell indication, mobile terminal is determined the community met the following conditions:

A. when mobile terminal low speed moves:

I. meeting H >=0 community in, there are whole communities of the measurement of the highest HCS_PRIO value

If ii. do not have community to meet H >=0, whole communities of measuring, and irrelevant with the HCS_PRIO value

B. when the mobile terminal high-speed mobile:

I. meeting H >=0 community in, when having HCS priority lower than the community of the HCS priority of current service cell (condition 1):

1. in the HCS priority Di community of HCS priority ratio current service cell, meeting H >=whole communities of the measurement of the highest HCS_PRIO value there are in 0 community.

Ii. other situation (that is, when do not satisfy condition 1 time):

1. if any community meets H >=0, in HCS priority in the community greater than or equal to the HCS priority (condition 2) of current service cell:

A. in the community greater than or equal to the HCS priority of current service cell, meeting H in HCS priority >=whole communities of the measurement of minimum HCS_PRIO value there are in 0 community

2. other situation (that is, when do not satisfy condition 2 time)

A. whole communities of measuring, and do not consider HCS priority

2. for community definite in said process 1, in the community that meets the S criterion, mobile terminal is carried out deciding grade and level based on the R criterion and is processed, and selects to have (a plurality of) community of best in quality, and carries out community selection (gravity treatment) for this community.

In above-mentioned explanation, mobile terminal determines by described S criterion whether various communities meet the minimum mass guaranteed conditions.That is to say, the S criterion is for determining whether specific cell meets lowest term required when carrying out paging or RRC connection.

More than introduced the cell reselection process of mobile terminal when being provided with HCS, and, according to this process, occurred that mobile terminal can not select the situation of community that can be resident, thereby can not correctly receive business.For example, can consider following cell structure.

Community	The H criterion	The S criterion	HCS_PRIO
				A	Meet	Do not meet	4
B	Do not meet	Meet	4
				C	Meet	Meet	3

According to prior art, mobile terminal is carried out following operation:

Step 1: carry out necessary measurement.

Community A, community B and community C have been measured.

Step 2: check whether to exist to meet H criterion H >=any community of 0.

Community A and community C meet the H criterion.

Step 3: in step 2, check in the Chu community and identify the highest HCS_PRIO.

Having the highest HCS_PRIO at community A and C Zhong， community, community A, is 4.

Step 4: identify the community with the described HCS_PRIO identified in step 3.

Community A has unique community of the highest HCS_PRIO.

Step 5: check the community that meets the S criterion in the community of identifying in step 4.

Community A does not meet the S criterion.

Step 6: carry out deciding grade and level in the community of identifying in step 5.

There do not is the candidate cell of being defined the level.

At above-mentioned table 1, mobile terminal should be selected community C, but in the prior art, mobile terminal can't be selected any community.That is to say, in the prior art, at first mobile terminal selects to meet (a plurality of) community of H criterion, then in the community that meets the H criterion, selects best cell.Therefore, in the operating process according to the H criterion, if there is the community that does not meet the S criterion but meet the H criterion, exist the problem that mobile terminal is provided with unsuitable HCS_PRIO value.In this case, mobile terminal can not find and can receive from it community of business, thereby has occurred making a call or the problem of answering call.

Therefore, for the system of using the HCS function, the invention provides a kind of method for mobile terminal, the method can or only support the wireless protocols of PS business suitably the data that generate during will receiving the community of business setting from it effectively to be transmitted via the PS network.

For this reason, the process of the community of selecting to receive from it business, particularly, in current service cell, made while using the notice of HCS, when suggestion utilizes the H criterion to create the list of selectable community in the community that should be measured for mobile terminal, mobile terminal can be considered the S criterion.

In the present invention, when mobile terminal application H criterion, the community of having applied the H criterion is those communities that met the S criterion.

In the present invention, when by the present invention, having applied the H criterion, if each community meets the H criterion, carry out additional examination and whether also meet the S criterion to check, and, carry out deciding grade and level for the community that meets H criterion and S criterion and process.

Then, introduce the example of mobile terminal operation of the present invention.The process of selecting when use HCSShi， community is as follows:

1. for having carried out the community of measuring, mobile terminal determines which community meets the S criterion.Simultaneously, only following step 2 is carried out in determined community.

2. in the community that meets above-mentioned steps 1, that is, in the community that meets the S criterion, mobile terminal is determined the community that meets following additional conditions.

A. when mobile terminal low speed moves:

B. when the mobile terminal high-speed mobile:

1. in the community lower than the HCS priority of current service cell, meeting H in HCS priority >=whole communities of the measurement of the highest HCS_PRIO value there are in 0 community.

Ii. other situation (that is, when do not satisfy condition 1 time):

2. other situation (that is, when do not satisfy condition 2 time)

A. whole communities of measuring, and do not consider HCS priority

3. in above-mentioned steps 2 in definite community, mobile terminal is carried out deciding grade and level based on the R criterion and is processed, and selects to have the community of best in quality, and carries out community selection (gravity treatment) for this community.

When using HCS, according to the community of another embodiment of the present invention, select step as follows:

1. in the situation that current service cell indicates this current Serving cell to use HCS, mobile terminal is determined the community met the following conditions:

A. when mobile terminal low speed moves:

I. meeting H >=0 and meet in the community of S criterion, whole communities of the measurement of the highest HCS_PRIO value there are

If ii. do not have community to meet H >=0 and meet the S criterion, meet whole communities of the measurement of S criterion, and irrelevant with the HCS_PRIO value

B. when the mobile terminal high-speed mobile:

I. meeting H >=0 and meet in the community of S criterion, when having HCS priority lower than the community of the HCS priority of current service cell (condition 1):

1. in the HCS priority Di community of HCS priority ratio current service cell, meeting H >=0 and meet the whole communities that there is the measurement of the highest HCS_PRIO value in the community of S criterion.

Ii. other situation (that is, when do not satisfy condition 1 time):

1. if any community meets H >=0 and meet the S criterion, in HCS priority in the community greater than or equal to the HCS priority (condition 2) of current service cell:

A. in the community greater than or equal to the HCS priority of current service cell, meeting H in HCS priority >=0 and meet in whole communities of measurement of S criterion and there is minimum HCS_PRIO Zhi community

2. other situation (that is, when do not satisfy condition 2 time)

A. meet whole communities of the measurement of S criterion, and do not consider HCS priority

2. for community definite in above-mentioned steps 1, mobile terminal is carried out deciding grade and level based on the R criterion and is processed, and selects to have (a plurality of) community of best in quality, and community selection (gravity treatment) is carried out in the Dui Gai community.

For the example shown in above-mentioned table 1, operating result of the present invention can be described below:

Step 1: carry out necessary measurement.

Community A, community B and community C have been measured.

Step 2: check and whether have any community that meets the S criterion.

Community B and community C meet the S criterion.

Step 3: step 2 check in the Chu community check whether to exist meet H criterion H=any community of 0.

Meet the H criterion at community B and C Zhong， community, community C.

Step 4: in step 3, check in the Chu community and identify the highest HCS_PRIO.

Community C has the highest HCS_PRIO, is 3.

Step 5: identify the community with the described HCS_PRIO identified in step 4.

Community C has unique community of the highest HCS_PRIO.

Community C is the candidate cell for deciding grade and level.

Result of the present invention is as follows.As described in up till now, for the cell structure that adopts the HCS function, mobile terminal is carried out community and is selected, thereby suitably uses H criterion and S criterion, and making it possible to provides business according to more stable and efficient mode for mobile terminal.

About some concrete conditions of concept of the present invention and feature are explained as follows:

Concrete condition #1

If do not use HCS in Serving cell, UE will be defined the level in following community, whole communities that meet the S criterion:

-whole communities of measuring.

If used HCS in Serving cell, UE will be defined the level in following situation, whole communities that meet the S criterion:

1. when when low speed moves

-meeting H criterion H >=whole communities of the measurement of high HCS_PRIO there are in 0 community.

If-do not have community to meet H criterion H >=0, whole communities of measuring, and do not consider the HCS priority level.

According to above-mentioned situation, if UE low speed moves and has a H >=0 community, UE carries out following steps:

Step 1: carry out necessary measurement.

Step 2: check whether to exist to meet H criterion H >=any community of 0.

Step 3: check in step 2 in the Chu community and identify the highest HCS_PRIO.

This process has the highest HCS_PRIO and H >=0 community meets under the scene of S criterion usually effectively.But, if there is the highest HCS_PRIO and H >=0 community do not meet the S criterion, and UE can not select any community.

Example and the characteristic thereof of community (A, B, C) are as follows:

After having applied above-mentioned steps, can obtain following result:

Step 1: carry out necessary measurement.

Community A, community B and community C have been measured.

Step 2: check whether to exist to meet H criterion H >=any community of 0.

Community A and community C meet the H criterion.

Community A has unique community of the highest HCS_PRIO.

Community A does not meet the S criterion.

There do not is the candidate cell of being defined the level.

Therefore, in above-mentioned scene, although there is the community that meets the S criterion, in the deciding grade and level list, there do not is community.Due to UE can not the gravity treatment best in quality community, thereby problem has appearred.

Prior art normally supposes to exist all the time the community that can define the level, and does not specify any content for the situation of the community that does not have to define the level.Therefore, the action of UE after the step 6 of above-mentioned scene unclear.Therefore, caused UE action disunity.Can consider following explanation.

Option one: after the result as step 6 notices there is not the community that can define the level, UE announces " there is no network ".And final, UE carries out initial cell and selects, and this causes long interruption.

Option 2:UE does not carry out any action.That is to say, owing to there is no the community that can define the level, so UE still continues to reside in current service cell.But because the candidate cell for the processing of defining the level is not considered Serving cell usually, so this can cause problem.And, before Serving cell does not meet the S criterion, UE resides in non-best cell always.

But the method addressed this problem is, when the candidate who selects for deciding grade and level, UE considers H criterion and S criterion simultaneously, and thus, advantage is, even can avoid existing the community that meets the S criterion still do not have the situation for the candidate cell of deciding grade and level.

Concrete condition #2

Understanding form A

According to the above description, the implementation that the first is possible is that at first UE checks the H criterion, then checks the S criterion.

In this implementation, if UE low speed moves, and have H >=0 community, UE carries out following steps:

Step 1: carry out necessary measurement.

Step 2: check whether to exist to meet H criterion H >=any community of 0.

Understanding form B

Another kind of possible implementation is that at first UE checks the S criterion, then checks the H criterion.

Step 1: carry out necessary measurement.

Step 2: check and whether have any community that meets the S criterion.

Then, analyze the action of UE according to above-mentioned understanding form A and B.Can consider following exemplary scene:

Follow the cell reselection of understanding form A

According to said process, following steps may appear:

Step 1: carry out necessary measurement.

Community A, community B and community C have been measured.

Step 2: check whether to exist to meet H criterion H >=any community of 0.

Community A and community C meet the H criterion.

Community A has unique community of the highest HCS_PRIO.

Community A does not meet the S criterion.

There do not is the candidate cell of being defined the level.

Follow the cell reselection of understanding form B

According to said process, following steps may appear:

Step 1: carry out necessary measurement.

Community A, community B and community C have been measured.

Step 2: check and whether have any community that meets the S criterion.

Community B and community C meet the S criterion.

In community B and community C, C meets the H criterion.

C has the highest HCS_PRIO, is 3.

Community C has unique community of the highest HCS_PRIO.

Community C is the candidate cell for deciding grade and level.

The correction of different actions

When checking above-mentioned scene, can see, there is the candidate cell that UE can be resident.Community C meets H criterion and S criterion simultaneously.But, have the community that can define the level in understanding form B, and do not have the community that can define the level in understanding form A.Because UE can not any related cell of gravity treatment, so the action of understanding form A will cause problem.UE may announce " there is no network ", and starts search fully, and this causes long interruption.

The subject matter of implementation A is, suitably do not consider S criterion (, do not meet the S criterion but the community that meets the H criterion has affected the judging process of the highest HCS_PRIO) when selecting the highest HCS_PRIO value.Therefore, should be revised the process of prior art, make in the step relevant with the H criterion and also consider the S criterion.

Suggestion 1: the community of considering to meet the S criterion in the processing relevant with the H criterion

Above-mentioned situation normally supposes to exist all the time the community that can define the level.But prior art is not specified any content for the situation of the community that does not have to define the level.Therefore, the action of UE unclear when there is no the community that can define the level.Therefore, caused UE action disunity.

Suggestion 2: whether suggestion is discussed needs to specify any concrete condition when not having the community that can define the level.

The simplest method that overcomes this problem is that UE considers H criterion and S criterion when the candidate cell of selecting for defining the level simultaneously.Thus, even can prevent from having the community that meets the S criterion but the situation that does not also still have the candidate cell for defining the level.

The cell reselection evaluation process

The cell reselection criterion

Following cell reselection criterion is for (inter-RAT) community between (inter-frequency) community and RAT between (intra-frequency) community, frequency in frequency:

Credit rating threshold value criterion H for layered cell structure applies the deciding grade and level (prioritised ranking) according to minute priority of hierarchical cell reselection rule for determining whether, and is defined by following formula:

If indicated and do not used HCS in system information (SI), application quality grade threshold criterion H not.

Community deciding grade and level criterion R is defined by following formula:

Wherein: the value Qoffmbms transmitted by signal only is applied to belong to those communities (Serving cell or neighbor cell) of MBMS PL, and

Wherein:

TOn=TEMP_OFFSETn*W(PENALTY_TIMEn-Tn)

If Ln=0 is HCS_PRIOn=HCS_PRIOs

If Ln=1 were HCS_PRIOn<> HCS_PRIOs

W (x)=0 is for x<0

W (x)=1 is for x >=0

After for neighbor cell, having started timer Tn, TEMP_OFFSETn, at the duration of PENALTY_TIMEn, applies biasing to H criterion and R criterion.

TEMP_OFFSETn and PENALTY_TIMEn only just can apply when in system information, HCS has been used in indication.

Timer Tn implements for each neighbor cell.When one of following condition is true time, Tn should be since 0:

If-HCS_PRIOn<HCS_PRIOs and

Qmeas,n>=Qhcsn

Perhaps

If HCS_PRIOn=HCS_PRIOs and

-for service FDD community and adjacent FDD community, if be set to the CPICH RSCP of Serving cell for the mass measurement of community selection and gravity treatment, and:

Qmeas,n>Qmeas,s+Qoffset1s,n

-for service FDD community and adjacent FDD community, if be set to the CPICH Ec/N0 of Serving cell for the mass measurement of community selection and gravity treatment, and:

Qmeas,n>Qmeas,s+Qoffset2s,n

-for all other Serving cells and neighbor cell:

Qmeas,n>Qmeas,s+Qoffset1s,n

Once no longer meet any one in above-mentioned condition, just should stop the Tn of relevant neighbor cell.As long as relevant timer Tn still turns round, any value of calculating for TOn is all effective; Otherwise TOn should be set to 0.

When cell reselection, as long as corresponding community is not the neighbor cell of new Serving cell, or, if the parameter of new Serving cell no longer meet above-mentioned provide when starting the criterion for the timer Tn of corresponding community, timer Tn stops.When cell reselection, timer Tn should continue for the running of corresponding community, still, if corresponding community is the neighbor cell of new Serving cell, should utilize the parameter of broadcasting in new Serving cell to be assessed the above-mentioned criterion provided.

Can be provided in the cell reselection parameters of being broadcasted in system information.

In the following cases, meet the cell reselection S criterion for cell reselection:

For FDD community: Srxlev > 0 and Squal 0

For TDD community: Srxlev > 0

For GSM community: Srxlev > 0

Wherein:

If do not use HCS in Serving cell, UE should be defined the level to the whole communities that meet the S criterion in following community:

-whole communities of measuring.

If current service cell is used HCS, UE should be defined the level to the whole communities in following situation:

1. when when low speed moves:

I. meeting H criterion H >=0 and meet in the community of S criterion and there are whole communities of the measurement of high HCS_PRIO.

If ii. do not have community to meet H criterion H simultaneously >=0 and the S criterion, meet whole communities of the measurement of S criterion, and do not consider the HCS priority level.

2. when in high-speed mobile:

-whole communities of measuring, and in these communities:

If i. meet at the same time H criterion H >=0 and the community of S criterion in, have the community of HCS priority lower than the HCS priority of Serving cell:

1. meet at the same time H criterion H >=0 and the community of S criterion in, there are whole communities of the highest HCS_PRIO in the community in HCS priority lower than the HCS priority of Serving cell;

-otherwise:

If-exist to meet H criterion H simultaneously=0 and S criterion and HCS priority greater than or equal to the community of the HCS priority of Serving cell:

In-community in HCS priority greater than or equal to the HCS priority of Serving cell, meet H criterion H >=0 and meet the whole communities that there is minimum HCS_PRIO in the community of S criterion;

-otherwise:

-meet whole communities of S criterion, and do not consider the HCS priority level.

Should be defined the level according to the R criterion Lai Dui community of top appointment, thereby be obtained Qmeas, n and Qmeas, s, and, utilize respectively for CPICH RSCP, the P-CCPCHRSCP of FDD community, TDD community and GSM community and average after Received signal level, calculate the R value.

Biasing Qoffset1s, n is for Qoffset, and n calculates Rn, and lagged value (hysteresis) Qhyst1s calculates Rs for Qhysts.For the UE in RRC connection mode state CELL_PCH or URA_PCH, lagged value Qhysts adopted value Qhyst1s, provide in SIB4 if PCH calculates Rs().For the UE in RRC connection mode state CELL_FACH, lagged value Qhysts adopted value Qhyst1s, provide in SIB4 if FACH calculates Rs().

If HCS has been used in indication in system information, TEMP_OFFSET1n calculates TOn for TEMP_OFFSETn.If HCS is not used in indication in system information, when calculating Rn, do not apply TEMP_OFFSETn.Deciding grade and level is to have the highest R Zhi community for best community.

If TDD community or GSM community are rated for best cell, UE should Dui Gai TDD community or the GSM community carry out cell reselection.

If the FDD community is rated for best cell and selects and the mass measurement of gravity treatment is set to CPICH RSCP for community, UE should carry out cell reselection in Dui Gai FDD community.If find this community improper, UE should correspondingly move.

If the FDD community is chosen as best cell and for selecting and the mass measurement of gravity treatment is set to CPICH Ec/No community, UE should be according to above-mentioned R criterion, but measure value CPICH Ec/No by utilization and obtain Qmeas, n and Qmeas, s also calculates the mode of the R value of FDD community, and Lai Dui FDD defines the level community for the second time.Biasing Qoffset2s, n is for Qoffsets, and n calculates Rn, and lagged value Qhyst2s calculates Rs for Qhysts.For the UE in RRC connection mode state CELL_PCH or URA_PCH, lagged value Qhysts adopted value Qhyst2s, provide in SIB4 if PCH calculates Rs().For the UE in RRC connection mode state CELL_FACH, lagged value Qhysts adopted value Qhyst2s, provide in SIB4 if FACH calculates Rs().If HCS has been used in indication in system information, TEMP_OFFSET2n is used to calculate TOn.If HCS is not used in indication in system information, when calculating Rn, do not apply TEMP_OFFSETn.Follow this and define the level for the second time, UE should carry out cell reselection for best FDD community for deciding grade and level.If find this community improper, UE should correspondingly move.

In the whole circumstances, while only meeting the following conditions, UE just should gravity treatment Xin community:

-during time interval Treselection, the rank of ，Xin community is higher than the rank of Serving cell.For the UE in RRC connection mode state CELL_PCH or URA_PCH, interval T reselection, (if providing in SIB4) is provided PCH, and for the UE in RRC connection mode state CELL_FACH, interval T reselection, (if providing in SIB4) is provided FACH.For layered cell structure, when high-speed moving state not detected, if according to the HCS rule to Serving cell deciding grade and level for preferential, will all define the level and be considered as being better than Serving cell for preferential community.

In addition, UE should be to Treselections or Treselection _{s, PCH}or Treselection _{s, FACH}apply following convergent-divergent rule:

-for community in frequency and high-speed moving state do not detected:

-do not apply convergent-divergent.

-for community in frequency and high-speed moving state detected:

-by Treselections or Treselection _{s, PCH}or Treselection _{s, FACH}be multiplied by IE " speed dependent ScalingFactor for_Treselection " (if sending) in system information.

-for inter-frequency cell and high-speed moving state do not detected:

-by Treselections or Treselection _{s, PCH}or Treselection _{s, FACH}be multiplied by IE " Inter-Frequency ScalingFactor for_Treselection " (if sending) in system information.

-for inter-frequency cell and high-speed moving state detected:

-by Treselections or Treselection _{s, PCH}or Treselection _{s, FACH}be multiplied by these two of IE " speed dependent ScalingFactor for_Treselection " (if sending) and IE " Inter-Frequency ScalingFactor for_Treselection " (if sending) in system information in system information.

-for the RATJian community and high-speed moving state do not detected:

-by Treselections or Treselection _{s, PCH}or Treselection _{s, FACH}be multiplied by IE " Inter-RAT ScalingFactor for Treselection " (if sending) in system information.

-for the RATJian community and high-speed moving state detected:

-by Treselections or Treselection _{s, PCH}or Treselection _{s, FACH}be multiplied by IE " speed dependent ScalingFactor for_Treselection " (if sending) and IE " Inter-RAT ScalingFactor for Treselection " (if sending) these two in system information in system information.

When to Treselections or Treselection _{s, PCH}during the application convergent-divergent, UE should all rounded up immediate second to result after convergent-divergent.When to Treselection _{s, FACH}during the application convergent-divergent, UE should all rounded up immediate 0.2 second to result after convergent-divergent.

-from UE reside in current service cell start through more than 1 second.

As mentioned above, various illustrative embodiments of the present invention relate to the cell selecting method based on cell quality in layered cell structure, and the method makes it possible to utilize more efficiently Radio Resource.

The invention provides a kind of cell selecting method for subscriber equipment (UE), the method comprises the following steps: check and whether using layered cell structure (HCS); Read the parameter relevant with the H criterion from system information; Carry out the measurement of community; In measured community, identification meets the community of S criterion; Check described H criterion for the community that meets described S criterion; And the community that selection has the highest R criterion in meeting described S criterion and this Liang Xiang community of described H criterion.

Described HCS has defined a plurality of overlapping community of the different size that forms a plurality of cell layer, and, if the Serving cell of UE belongs to described HCS, use described HCS.Described S criterion is selection criterion or the washability criterion whether enough checked for the quality of reception to candidate cell, described H criterion be when having adopted HCS, used, as the information sent in based on system information, calculate on the occasion of or the HCS criterion of negative value, and described R criterion is the deciding grade and level criterion that UE is defined the level for the cell list to meeting described S criterion.Measured community is to determine by the frequency range all searching for, with base station, carrying out the signal measurement process, then, select characteristics of signals value Qiang community in the community that meets the specific cell alternative condition, and, the access for selected community carried out.

In addition, the invention provides a kind of cell selecting method for subscriber equipment (UE), the method comprises the following steps: if adopted layered cell structure (HCS) in the Serving cell of described UE, when described UE low speed moves, the deciding grade and level processes are carried out in whole communities to measurement with the highest HCS priority in meeting S criterion and this Liang Xiang community, H criterion H >=0, perhaps, if do not meet S criterion and this Liang Xiang community, H criterion H >=0, regardless of HCS priority and to carrying out described deciding grade and level process in whole communities of measuring, and when the UE high-speed mobile, described deciding grade and level process is carried out in whole communities of measuring, and in described measurement Guo community, if there be the community of HCS priority lower than the HCS priority that meets this S criterion and this H criterion H >=0 this described Serving cell of two, in the HCS priority Di community of this Serving cell of HCS priority ratio, in meeting this S criterion and this H criterion H >=0 this Liang Xiang community, this deciding grade and level process is carried out in the whole communities with the highest HCS priority, otherwise, meet these two of this S criterion and this H criterion H >=0 if exist, HCS priority is greater than or equal to the community of the HCS priority of described Serving cell, in HCS priority in the community greater than or equal to the HCS priority of this Serving cell, in meeting this S criterion and this H criterion H >=0 this Liang Xiang community, this deciding grade and level process is carried out in the whole communities with minimum HCS priority, otherwise, regardless of HCS priority, this deciding grade and level process is carried out in whole communities.

Described layered cell structure (HCS) has defined a plurality of overlapping community of the different size that forms a plurality of cell layer.Described UE is based on the number of times of special time period small area gravity treatment or the RRC signaling based on carrying out automatic network and is confirmed as that low speed moves or high-speed mobile.Measured community is to determine by the frequency range all searching for, with base station, carrying out the signal measurement process, then, select characteristics of signals value Qiang community in the community that meets the specific cell alternative condition, and, the access for selected community carried out.Use at least one in CPICH RSCP, CPHIC Ec/N0 and carrier wave RSSI in described signal measurement process.

When the candidate cell of selecting for defining the level, under the condition of considering described criterion H and described S criterion, by described deciding grade and level process, obtain showing the relative signal intensity of measured community or the rank that minizone covers overlapping degree.Described deciding grade and level process is based on described R criterion and carries out, and community is selected or gravity treatment is to carry out for one or more community with best in quality for deciding grade and level.Described HCS priority means UE should be defined in which cell layer of described HCS.Described HCS priority sends with the form of system information block as the part of cell broadcast information, and alternatively, for neighbor cell, described HCS priority is measured the part of control message and sends as RRC.Described S criterion is selection criterion or the washability criterion whether enough checked for the quality of reception to candidate cell, and, described H criterion be when having adopted HCS, used, as the measured value of the information sent in based on system information the CPICH/P-CPCCH based on according to candidate cell, calculate on the occasion of or the HCS criterion of negative value.

Can realize the various features and the concept that illustrate here according to software, hardware or their combination.For example, the computer program (this computer program is carried out in computer, terminal or the network equipment) for the treatment of the method and system of the cell selecting method based on cell quality in layered cell structure can comprise one or more program code segments of carrying out various tasks.Similarly, the Software tool (this Software tool is carried out in computer, terminal or the network equipment) for the treatment of the method and system of the cell selecting method based on cell quality in layered cell structure can comprise the program code part of carrying out various tasks.

According to the method and system for the treatment of the cell selecting method based on cell quality in layered cell structure of the present invention and various types of technology and operating such.Here the specific concept of explanation relates to various types of standards, such as GSM, 3GPP, LTE, IEEE, 4G etc.Yet be appreciated that because other relevant standard and technology also go for the various features and the concept that illustrate here, so the standard of above example is not in order to be limited.

Industrial applicability

Here the various subscriber equipmenies that the feature of explanation and concept are applicable to be configured to be supported in the cell selecting method based on cell quality in layered cell structure (for example, mobile terminal, mobile phone, Wireless Telecom Equipment etc.) and/or network entity, and can in these subscriber equipmenies and network entity, realize these features and concept.

Owing to realizing each conception of species of illustrating and feature here and not break away from the feature of explanation here according to various ways; so it is also understood that; unless explicitly pointed out separately; otherwise any details before above-mentioned execution mode is not limited in explanation, but broadly make an explanation within the protection range that should limit in claims.Therefore, claims are intended to contain whole changes and the modification fallen within this scope and equivalent thereof.

Claims

1. a method of carrying out cell reselection for user equipment (UE), described method comprises:

Carry out the measurement of community;

Determine and whether use layered cell structure HCS in Serving cell;

If used described HCS in described Serving cell, deciding grade and level is carried out in the measured community that meets the first criterion and the second criterion; And

Best cell in the deciding grade and level of the measured community that meets described the first criterion and described the second criterion is carried out to cell reselection,

Wherein, described the first criterion is for selecting to meet the measured community of minimum quality condition, and described the second criterion is for determining whether the deciding grade and level of application according to minute priority of hierarchical cell reselection rule.

2. method according to claim 1, wherein, described HCS has defined a plurality of overlapping community of the different size that forms a plurality of cell layer.

3. method according to claim 1, wherein, described the first criterion is the community selection criterion S for cell reselection.

4. method according to claim 1, wherein, described the second criterion is the credit rating threshold value criterion H for cell reselection.

5. method according to claim 1, wherein, if do not use described HCS in described Serving cell, do not consider described the second criterion.

6. method according to claim 1, wherein, the number of times based on cell reselection in special time period or the radio resource control RRC signaling based on carrying out automatic network determine that described UE has Hypomobility or high mobility.

7. method according to claim 1, wherein, determine measured community by the frequency range all searching, with base station, carrying out the signal measurement process, then, select characteristics of signals value Qiang community in the community that meets the specific cell alternative condition, and, carry out the access for selected community.

8. method according to claim 7 wherein, is used Common Pilot Channel received signal code power CPICH RSCP, CPICH carrier-to-noise than at least one in Ec/N0 and carrier wave received signal strength indicator symbol RSSI in the signal measurement process.

9. method according to claim 1, wherein, described the second criterion is calculated in the measurement of the information based on sending in system information and the Common Pilot Channel based on from candidate cell/Primary Common Control Physical Channel CPICH/P-CPCCH.

10. method according to claim 1, wherein, described the first criterion is considered to have precedence over described the second criterion and carries out deciding grade and level for measured community.

11. a subscriber equipment that is configured to carry out cell reselection, described subscriber equipment comprises:

Processor, described processor is configured to:

Carry out the measurement of community;

Determine and whether use layered cell structure HCS in Serving cell;