WO2006094455A1

WO2006094455A1 - Method for frequency layer dispersal of ue in the multimedia broadcast/multicast service

Info

Publication number: WO2006094455A1
Application number: PCT/CN2006/000340
Authority: WO
Inventors: Hao Hu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-03-07
Filing date: 2006-03-07
Publication date: 2006-09-14
Also published as: CN100389615C; CN1832589A

Abstract

A method for frequency layer dispersal of UE in the Multimedia Broadcast/Multicast service, in which at least two kinds of frequency layer dispersal algorithms are saved in UE, the frequency layer dispersing process includes: A. Network side transmitting the indication to UE, which determines to adopt which kind/kinds of frequency layer dispersal algorithms to execute the frequency layer dispersal; B. according to the indication transmitted by the network side, UE selecting the corresponding frequency layer dispersal algorithms to execute the frequency layer dispersal. Using the method provided in the invention, UE can flexibly select and use the frequency dispersal algorithms in order to accommodate the different network situation. Simultaneously, because the network side can control UE’ s selection at random, the user distribution is more equalized in the whole network.

Description

Method for frequency layer dispersion of user equipment in multimedia broadcast/multicast service

The present invention relates to a multimedia broadcast/multicast service (MBMS) implementation technology, and more particularly to a method for frequency layer decentralization (FLD) of a user equipment (UE) in a multimedia broadcast/multicast service. Background of the invention

Currently, multicast and broadcast are technologies that transmit data from one data source to multiple destinations. In a conventional mobile network, a Cell Broadcast Service (CBS) allows low bit rate data to be transmitted to all users through a cell shared broadcast channel, belonging to a message type service.

Nowadays, the demand for mobile communication is no longer satisfied with the telephone and message services. With the rapid development of the Internet, a large number of multimedia services have emerged. Some of these applications require multiple users to receive the same data at the same time, such as video on demand, TV. Broadcast, video conferencing, online education, interactive games, etc. Compared with general data, these mobile multimedia services are characterized by large data volume, long duration, and delay sensitivity. The current IP multicast technology is only applicable to wired IP networks, not to mobile networks, because mobile networks have specific network structures, functional entities, and wireless interfaces, which are different from wired IP networks.

In order to effectively utilize mobile network resources, WCDMA/GSM Global Standards Organization 3GPP has proposed multicast and broadcast services (MBMS: Multimedia Broadcast/Multicast Service), which provides a data source to transmit data to multiple users at the point in the mobile network. Point services, realize network resource sharing, and improve the utilization of network resources, especially the utilization of air interface resources. MBMS defined by 3GPP can not only realize plain text low-rate message class multicast and broadcast, but also realize high-speed multimedia service multicast and broadcast, which is undoubtedly compliant The trend of future mobile data development.

In order to support the MBMS service, a mobile network function entity, the Broadcast Multicast Service Center BM-SC, is added to the mobile network, which is an entry for the content provider to authorize and initiate the MBMS bearer service in the mobile network, and according to the reservation. Time plans to deliver MBMS content. In addition, functional entities such as User Equipment (UE), Terrestrial Radio Access Network (UTRAN), GERAN, SGSN, and GGSN are enhanced to add MBMS-related functions.

See Figure 1 for such a network structure. Figure 1 is a schematic diagram of a wireless network structure supporting multicast/broadcast services. The Broadcast/Multicast Service Center (BM-SC) is connected to the Gateway General Packet Radio Service (GPRS) Support Node (GGSN) via a Gmb interface or a Gi interface, and one BM-SC can be connected to multiple GGSNs. The GGSN is connected to the Serving GPRS Support Node (SGSN) through the Gn/Gp interface, and one GGSN can be connected to multiple SGSNs; the SGSN can communicate with the Universal Mobile Telecommunications System (UMTS) terrestrial radio access network through the Iu interface ( UTRAN is connected, then UTRAN is connected to the communication terminal through the Uu interface, and the SGSN can also be connected to the Global System for Mobile Communications (GSM) Enhanced Radio Access Network (GERAN) through the Iu/Gb interface, and then the GERAN is connected to the communication terminal through the Um interface.

MBMS includes multicast mode and broadcast mode. The difference between the multicast service and the broadcast service is only that: The multicast service only sends corresponding information to users who subscribe to certain information, and the broadcast service sends information to all users in the wireless network. The multicast mode requires the user to subscribe to the corresponding multicast group, perform service activation, and generate corresponding accounting information. Because the multicast and broadcast modes differ in business requirements, their business processes are different.

The MBMS service has two modes when transmitting between UTRAN and UE: point-to-multipoint (PTM) mode and point-to-point (PTP) mode. The PTM mode transmits the same data through the MBMS point-to-multipoint traffic channel (MTCH), and all UEs that join the multicast service or are interested in the broadcast service can receive; the FI mode transmits data through the dedicated transport channel (DTCH), only A corresponding UE can receive it.

See Figure 2 for the complete process of receiving a certain MBMS broadcast service. As shown in Figure 2, the process includes: Service announcement, Session Start, MBMS notification, Data transmission. Transfer ), Session End process.

The Service announcement process is used by the BM-SC to announce the services currently available.

During the Session Start process, the BM-SC prepares the data transmission and informs the network to establish the bearer resources of the corresponding core network (CN) and the universal terrestrial radio access network (UTRAN).

The MBMS notification procedure is used to inform the UE that the MBMS multicast session is about to begin. During the data transfer process, the BM-SC transmits data to the UE through the bearer resources established during the start of the session.

The Session Stop procedure is used to release the bearer resources established by the Session Start process. In the broadcast service, the bearer context of the MBMS service is saved in each MBMS service node, and the bearer context is activated during the Session Start process and is deactivated during the Session Stop process.

See Figure 3 for the complete process of receiving a certain MBMS multicast service. The process includes: Subscription, Service announcement, Joining, Session Start, MBMS. MBMS notification, Data transfer, Session Stop, and Leaving procedures.

The Subscription process is used to allow users to subscribe to the required MBMS service in advance. The service announcement process is used by the BM-SC to announce the services currently available. The Joining process is an MBMS multicast service activation process. In the Joining process, the UE notifies the network that it is willing to become a member of the current multicast group and receives multicast data of the corresponding service. The Joining process creates a record of UE information in the network and the UE joining the multicast group.

MBMS UE context.

During the Session Start process, the BM-SC prepares the data transmission and notifies the network to establish the corresponding

CN and UTRAN bearer resources.

The Session Stop procedure is used to release the bearer resources established by the Session Start process. The Leaving process causes subscribers in the group to leave the multicast group, ie the user no longer receives multicast data, and the process deletes the corresponding MBMS UE context.

In the above Session Start process, in order to save system resources, the UTRAN requests the UE to reselect a frequency layer, and the MBMS service will be transmitted on this frequency layer. The network transmits this information to the UE over the MCCH channel. This process is called Frequency Layer Convergence (FLC). Through this process, the UTRAN can converge the UE to a frequency.

In the above session stop (Session Stop), since the FLC process may be performed, many UEs that have received the MBMS service are re-selected to a certain frequency layer, but if so many UEs perform non-MBMS services, then This can cause significant congestion in the system, so the MBMS system has devised another process called the Frequency Layer Decentralization Process (FLD). The network sends an indication to the UE whether to perform FLD on the MCCH channel.

At present, the protocol only specifies whether the system needs to perform the FLD process. The process is as follows:

1. The network side instructs the UE to perform an FLD process;

2. After receiving the FLD instruction, the UE performs a frequency layer dispersion process, and reselects a frequency to perform frequency layer dispersion. The method of selection is to select one of the selectable frequencies by a pseudo-random function algorithm. Generally, the UE stores an algorithm of a pseudo-random function, and after receiving the FLD instruction, the frequency layer dispersion process is performed.

The network side can distribute the UE to different frequency layers through the FLD process, but the method of how the UE can be effectively dispersed to different frequency layers through the FLD process is only a pseudo-random function algorithm.

The drawback of this method is that it does not take into account various network conditions such as the distribution of UEs in the network, the distribution of cells, the quality of cell channels, congestion, and the like. Since the network situation is complex and variable, it is obvious that there is only one algorithm, and it is impossible to achieve a good frequency layer dispersion effect for all cases. For example: It may cause the UE to perform two cell reselection procedures. Because the randomly selected cell may not be a good cell for some UEs, the UE may perform another cell selection process. If the UE does not immediately perform cell reselection based on the frequency determined by the pseudo-random function, the UE has to re-measure to select a suitable cell, causing the UE to perform a pseudo-random process in vain, resulting in a large delay.

In short, the existing FLD solution is only that the UE itself decides to use a fixed frequency layer dispersion algorithm to perform frequency layer dispersion, which cannot be adapted to the complex changes of the network. Summary of the invention

In view of this, the main object of the present invention is to provide a method for user equipment to perform frequency layer dispersion in a multimedia broadcast/multicast service, in which the UE can flexibly select and use a frequency layer dispersion algorithm.

To achieve the above objective, the technical solution of the present invention is specifically implemented as follows: A method for performing frequency layer dispersion in a user equipment in a multimedia broadcast/multicast service, storing at least two frequency layer dispersion algorithms in the user equipment UE, and a frequency layer The process of dispersion includes the following steps:

A. When the network side needs to perform the frequency layer decentralization operation, which one is sent to the UE Or which frequency layer dispersion algorithm performs an indication of frequency layer dispersion;

B. The UE selects a frequency layer algorithm according to the indication sent by the network side to perform frequency layer dispersion.

The time required for the frequency layer decentralization operation may be: in the process of transmitting the multimedia broadcast/multicast service data on the network side; or in the end of the multimedia broadcast/multicast service session; or in the multimedia broadcast/multicast After the scheduled time for the end of the business session.

In the step A, the network side may send an indication to the UE whether to perform frequency layer dispersion before or at the same time as the frequency layer decentralization algorithm is used to be sent to the UE. In step B: the UE first performs according to whether An indication of frequency layer dispersion determines whether frequency layer dispersion is performed; if so, determining a frequency layer dispersion algorithm for performing frequency layer dispersion according to the indication, and finding a determined frequency layer dispersion algorithm from the stored frequency layer dispersion algorithm, using the frequency The layer decentralization algorithm performs frequency layer dispersion; otherwise, the frequency layer decentralization operation is not performed according to the indication.

The method of transmitting to the user equipment UE whether to perform frequency dispersion and indicating which one or which frequency layer dispersion algorithms are used for the frequency layer dispersion may be: a control message through a point-to-multipoint control channel or a broadcast channel. Indicated in the middle or by two control messages.

A plurality of indication policies may be set and stored on the network side, and each indication policy includes: in which network case, which one or which frequency layer dispersion algorithms are used;

Before the network side sends the indication, it determines whether the current network condition complies with the network condition indicating the policy. According to the policy, the UE is instructed to use the frequency layer dispersion algorithm in the policy to perform frequency layer dispersion.

The network situation may include, but is not limited to, one or more of the following: the number and distribution of the UE in the cell, the distribution of the cell, the channel quality of the cell, the congestion, the frequency usage of each cell, and the frequency planning. Happening.

In step A, the network side indicates which frequency layer dispersion algorithm is used by the UE to perform the frequency layer. In the case of dispersion, the method for determining the frequency layer dispersion algorithm for performing frequency layer dispersion in step B may be:

The frequency layer dispersion algorithm in the indication is determined as an algorithm for spreading the frequency layer.

In step A, when the network side indicates which frequency layer dispersion algorithm is used by the UE to perform frequency layer dispersion, the method for determining the frequency layer dispersion algorithm for performing frequency layer dispersion in step B may be:

A frequency layer dispersion algorithm is selected from several frequency layer dispersion algorithms in the indication, and is determined as an algorithm for performing frequency layer dispersion.

The method for selecting a frequency layer dispersion algorithm from the several frequency layer dispersion algorithms in the indication may be: randomly selected or selected in the order of reception or selected in a preset selection order.

When a frequency layer dispersion algorithm is randomly selected, a function algorithm that can be uniformly selected can be used for random selection. ..

The function algorithm capable of uniform selection may be a hash algorithm or a random function algorithm. In step A, when the network side instructs the UE to use the frequency layer dispersion algorithm to perform frequency layer dispersion, the network may further indicate the priority order of the UEs or the conditions or selection rules for the UE to select from the algorithms. Or which feature of the UE uses the frequency layer dispersion algorithm of each of the several frequency layer dispersion algorithms;

The UE selects a frequency layer dispersion algorithm according to the priority selection order in the indication, and determines an algorithm for performing frequency layer dispersion; or uses the frequency layer dispersion according to the selection condition in the indication or the selection rule or the characteristics of the UE respectively. Which frequency layer dispersion algorithm of the algorithm selects a frequency layer dispersion algorithm and determines an algorithm for performing frequency layer dispersion.

In step A, when the network side indicates which frequency layer decentralization algorithm is used by the UE to perform frequency layer dispersion, the UE may further indicate which characteristics have used the frequency layer respectively. Which frequency layer dispersion algorithm of the algorithm is used;

In the step B, the UE determines, according to its own condition, which frequency layer decentralization algorithm should be used according to its own condition, and determines a frequency layer dispersion algorithm for performing frequency layer dispersion.

The method for indicating which of the characteristics of the UE respectively uses the frequency layer decentralization algorithm of the frequency layer decentralization algorithms may be: indicating different frequency layer dispersion algorithms for UEs of different cells;

In the step B, the UE determines, according to the indication, a frequency layer dispersion algorithm corresponding to the cell in which the cell is located as a frequency layer dispersion algorithm for performing frequency layer dispersion.

In step A, when the network side indicates which frequency layer decentralization algorithm is used by the UE to perform frequency layer dispersion, the selection order of the UEs may be further indicated.

In the step B, the UE determines all or part of the algorithms as the algorithm for performing frequency layer dispersion according to the indication, and performs multiple frequency layer dispersion according to the selection order in the indication.

The method of indicating which one or which frequency layer dispersion algorithms are used for frequency layer dispersion may be: using binary data to indicate various frequency layer dispersion algorithms;

The network side and the UE use protocol default values to determine which binary data indicates which frequency layer dispersion algorithm is used;

Or the network side further sends binary data indication meaning information to the UE, and the UE learns, according to the information, which binary data indicates which frequency layer dispersion algorithm.

The step B may further include: after receiving the indication, the UE performs a probability check on the one or more frequency layer dispersion algorithms in the indication respectively;

The method for determining the frequency layer dispersion algorithm for performing frequency layer dispersion is as follows: the frequency layer dispersion algorithm that passes the probability check in the indication is determined as the frequency layer dispersion algorithm for performing frequency layer dispersion;

If the frequency layer dispersion algorithm in the indication fails the probability check, the UE randomly selects a frequency layer dispersion algorithm according to its own situation or a predetermined selection method. The method for the probability check may be: the network side sends a check probability factor to the UE for each frequency layer decentralization algorithm in the indication; after receiving the network side indication, the UE generates one for each frequency layer dispersion algorithm in the indication. The random number is compared with the corresponding check probability factor received from the network side, and if the random number is greater than the check probability factor, the check passes; otherwise, the calibration fails.

The network side may send different check probability factors to the UE according to a predetermined priority or selection order for different frequency layer dispersion algorithms in the indication.

The frequency layer dispersion algorithm may include, but is not limited to, the following algorithms: a pseudo random function algorithm, a hash function algorithm, an algorithm for spreading frequencies to frequencies before frequency layer aggregation, and a cell reselection algorithm.

It can be seen from the foregoing technical solution that, in the multimedia broadcast/multicast service of the present invention, the user equipment performs the frequency layer dispersion method, and the multiple frequency layer dispersion algorithms are stored in the UE, and the network side not only instructs the UE to perform frequency layer dispersion, but also Instructing the UE to use which one or more frequency layer dispersion algorithms to perform frequency layer dispersion; the UE selects a frequency layer dispersion algorithm according to the indication to perform frequency layer dispersion. Therefore, the UE can flexibly select and use the frequency layer dispersion algorithm to adapt to different network conditions. At the same time, the network side can control the random selection of the UE, so that the distribution of the entire network user is more balanced. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of a wireless network structure supporting multicast/broadcast services;

Figure 2 shows the complete process of receiving a MBMS broadcast service by the user;

Figure 3 shows the complete process for a user to receive a certain MBMS multicast service;

4 is a schematic diagram of a MCCH channel scheduling period;

FIG. 5 is a flowchart of processing a frequency layer dispersion process according to a first preferred embodiment of the present invention; FIG. 6 is a flowchart of a frequency layer dispersion process according to a second preferred embodiment of the present invention; FIG. 7 is a flowchart of a frequency layer dispersion process according to a third preferred embodiment of the present invention; FIG. 8 is a flowchart of a frequency layer dispersion process according to a fourth preferred embodiment of the present invention; FIG. The frequency layer dispersion process processing flow chart of the example. Mode for carrying out the invention

The present invention will be further described in detail below with reference to the accompanying drawings.

In the multimedia broadcast/multicast service of the present invention, the user equipment performs frequency layer dispersion. The general inventive idea is: storing two or more frequency layer dispersion algorithms in the UE, and the network side needs to perform frequency layer dispersion. In operation, the UE is sent an indication of which frequency layer spreading algorithm is used to perform frequency layer dispersion; after receiving the indication, the UE performs frequency layer dispersion according to the indication.

In an actual application, the network side may send an indication to the UE in which one or more frequency layer decentralization algorithms or/and whether to perform frequency layer dispersion in the process of transmitting the multimedia broadcast/multicast service data; At the end of the multicast service session, the UE is sent an indication of which one or which frequency layer decentralization algorithms are used or/and whether the frequency is dispersed; or may be sent to the UE after a predetermined time of ending the multimedia broadcast/multicast service session. Which one or more of the frequency layer dispersion algorithms or/and an indication of whether or not to perform frequency dispersion. In general, during the session receiving process, after receiving the session end notification sent by the CN, the UTRAN sends the above indication to the UE according to whether the frequency aggregation operation has been performed.

The network side indicates to the UE which one or which frequency layer decentralization algorithms are used for the frequency layer decentralization. The specific method is as follows: Set and store multiple indication policies on the network side, in each indication policy. Including: in which network case, which kind of frequency layer decentralization algorithm is used; before the network side issues an indication, it is determined that the current network condition complies with the network condition indicating the policy, and according to the policy, the UE is instructed to adopt Frequency layer in the strategy The decentralized algorithm performs frequency layer dispersion.

The invention will now be described in detail with reference to five preferred embodiments.

First preferred embodiment:

In this embodiment, the UE stores a pseudo-random function algorithm, a hash function algorithm, an algorithm for spreading frequency to a frequency before frequency layer convergence, and a cell re-selection algorithm. In practical applications, it can be other various frequency layer dispersion algorithms. A variety of indication policies are stored in the UTRAN on the network side. For example, according to the current number and distribution of the UE in the cell, the cell distribution condition of the cell, the channel quality, the congestion, the frequency usage of each cell, and the frequency planning situation, the UE is instructed to adopt the pseudo-random function in the above algorithm. The algorithm, or the above algorithm for spreading the frequency to the frequency before the frequency layer is aggregated, or first adopting the pseudo-random function algorithm and then adopting the hash function algorithm and the like. These indication policies can be set and stored by the developer according to different network conditions, and can be added or deleted during system maintenance.

Referring to FIG. 5, the frequency layer dispersion process of this embodiment is a flowchart of the frequency layer dispersion process according to the first preferred embodiment of the present invention. The process includes the following steps:

Step 501: The UTRAN receives the session end request of the MBMS service sent by the CN, and determines that the frequency layer convergence operation is performed on the MBMS service, and sends an indication message for performing the frequency layer scatter operation to the UE. If it is not necessary to perform a frequency layer layering operation, an indication that the frequency layer is not dispersed may also be sent to the UE.

Step 502: The UTRAN determines, according to the network condition, the network condition indicating the policy, and sends the indication information of the one or more frequency layer dispersion algorithms to the UE according to the network policy. It is assumed that this embodiment instructs the UE to perform frequency layer dispersion using a hash function algorithm.

In this embodiment, the instructing the UE to perform the frequency layer decentralization operation and indicating which one or more frequency layer decentralization algorithms are used are respectively sent to the UE one before and after the two control messages. In actual application, it can also be sent to the UE simultaneously in the same control message. The indication control information can be sent over a Point-to-Multipoint Control Channel (MCCH) or a Broadcast Channel (BCH).

The binary data or other means may be used to indicate which one or which frequency layer dispersion algorithms are used by the UE for frequency layer dispersion. If binary data is used, the UTRAN may further send binary data indication meaning information to the UE, and the UE learns, according to the information, which binary data indicates which frequency layer dispersion algorithm, and the information may be sent separately or in the above control message; The UTRAN and the UE may also use the protocol default value to specify which binary data indicates which frequency layer is to be distributed. In this case, the network side does not need to retransmit the binary data indication meaning information.

In this embodiment, it is assumed that the binary data of the pseudo-random function algorithm is 01; the binary data of the hash function algorithm is 10, and 00 means that the frequency layer decentralization operation is not performed.

Step 503: The UTRAN sends a check probability factor of 0 to 1 to the UE.

Step 504: After receiving the foregoing indication by the UTRAN, the UE determines to perform frequency layer dispersion, and first performs a probability check on the frequency layer dispersion algorithm corresponding to the indication by using a check probability factor.

If the UE receives an indication that frequency layer dispersion is not performed, the UE does not perform the rate check or perform the frequency layer dispersion operation according to the indication.

After receiving the foregoing indication by the UTRAN, the UE generates a random number of 0~1, compares it with the check probability factor received from the network side, and if the random number is greater than the check probability factor, the check passes; Otherwise the verification does not pass.

Step 505: The UE determines whether the verification is passed. If yes, step 506 is performed; otherwise, step 507 is performed.

Probability checking is an optional process. In practice, probabilistic checking is also not possible.

In this embodiment, the probability check is performed on the indication. In actual application, after the UE receives the indication, The probability check may be performed separately on one or more frequency layer decentralization algorithms in the indication; the decentralized algorithm is to be referred to; if the frequency layer decentralization algorithm in the indication fails to pass the probability check, the UE according to its own situation or predetermined The selection method selects a frequency layer dispersion algorithm.

The method for probabilistic checking may be: the network side sends a check probability factor to the UE for each frequency layer decentralization algorithm in the indication; after receiving the network side indication, the UE generates one for each frequency layer decentralization algorithm in the indication. The random number is compared with the corresponding check probability factor received from the network side, and if the random number is greater than the check probability factor, the check passes; otherwise, the check fails. The network side sends different check probability factors to the UE according to a predetermined priority or selection order for different frequency layer dispersion algorithms in the indication.

Step 506: The UE determines, according to the indication message that the frequency layer is dispersed by using the hash function algorithm received from the UTRAN, that the algorithm is a frequency layer dispersion algorithm for performing frequency layer dispersion, and finds a hash function algorithm from the stored frequency layer dispersion algorithm. The hash function algorithm is used to determine the dispersed frequency, and the frequency layer is dispersed to end the process.

Step 507: The UE selects a frequency layer dispersion algorithm according to its own situation or a predetermined selection method, and performs frequency layer dispersion by using the frequency determined by the selected frequency layer dispersion algorithm.

The UE may determine according to the strength of the neighboring cell frequency signal, the MBMS service provided by the neighboring cell, and the like. For example, if the cell frequency signal before the current frequency convergence is the strongest, the frequency is dispersed to the frequency before the frequency layer is aggregated, and the frequency is dispersed to the original frequency. If a neighboring cell does not provide the MBMS service required by the UE, The UE is not dispersed to the frequency of the neighboring cell.

Second preferred embodiment:

In this embodiment, the UE and the UTRAN are the same as the preferred embodiment 1, and the related content is stored, and is not repeated here.

Referring to FIG. 6 for the frequency layer dispersion process of this embodiment, FIG. 6 is a second preferred embodiment of the present invention. The frequency layer dispersion process processing flow chart of the example. The process includes the following steps: Step 601: The UTRAN receives the session end request of the MBMS service sent by the CN, and determines that the frequency layer convergence operation is performed for the MBMS service, and then sends an indication message for performing the frequency layer scatter operation to the UE.

Step 602: The UTRAN determines, according to the network condition, the network condition that indicates the current policy, and sends the indication information of the one or more frequency layer dispersion algorithms to the UE according to the network policy. It is assumed that the present embodiment instructs the UE to perform frequency layer dispersion using both the pseudo-random function algorithm and the hash function algorithm.

Step 603: The UE receives the indication that the UE uses the pseudo-random function algorithm and the hash function algorithm to perform frequency layer dispersion, and selects one algorithm from the two algorithms. If the pseudo-random function algorithm is selected, the algorithm is determined to be The frequency layer dispersion algorithm for frequency layer dispersion is performed, the pseudo-random function algorithm is found from the stored frequency layer dispersion algorithm, the dispersed frequency is determined by the pseudo-random function algorithm, and the frequency layer is dispersed by the determined frequency.

In this step, the frequency layer dispersion algorithm can be selected by random selection or in the order of reception or by a preset selection order. For example: A frequency layer decentralization algorithm is selected by an algorithm that can be uniformly selected, such as a hash algorithm or a random function algorithm.

Third preferred embodiment:

Referring to FIG. 7, FIG. 7 is a flow chart of the frequency layer dispersion process according to the third preferred embodiment of the present invention. The process includes the following steps:

Step 701: The UTRAN receives the session end request of the MBMS service sent by the CN, and determines that the frequency layer convergence operation is performed on the MBMS service, and then sends an indication message for performing the frequency layer scatter operation to the UE.

Step 702, the UTRAN determines, according to which network condition the current network situation is in accordance with According to the network policy, the indication information of which one or more frequency layer dispersion algorithms are used is sent to the UE. It is assumed that the present embodiment is to perform frequency layer dispersion by instructing the UE to adopt a pseudo-random function algorithm, a hash function algorithm, and an algorithm for spreading frequencies to frequencies before frequency layer convergence.

Step 703: The UTRAN sends an indication message to the UE for the priority order of the algorithms or the conditions or selection rules for selecting from the algorithms.

Step 704: After receiving the indication message, the UE selects a frequency layer dispersion algorithm according to the priority selection order in the indication, and determines an algorithm for performing frequency layer dispersion; or selects a frequency layer according to the selection condition or the selection rule in the indication. The decentralization algorithm is determined as an algorithm for performing frequency layer dispersion, and the algorithm is found from the stored frequency layer dispersion algorithm, and the dispersed frequency is determined by the algorithm, and the frequency layer is dispersed by the determined frequency.

For example, in this embodiment, the UTRAN notifies the UE to preferentially select the hash function algorithm; or informs the UE to select an algorithm for spreading the frequency to the frequency before the frequency layer is aggregated if the frequency of the previous UE is high. If the frequency signals of the connected cells are strong, the pseudo-random function algorithm and the like are selected.

Fourth preferred embodiment:

Referring to FIG. 8, FIG. 8 is a flow chart of the frequency layer dispersion process according to the fourth preferred embodiment of the present invention. The process includes the following steps:

Step 801: After receiving the session end request of the MBMS service sent by the CN, and determining that the frequency layer convergence operation is performed on the MBMS service, the UTRAN sends an indication message for performing a frequency layer decentralization operation to the UE.

Step 802: The UTRAN determines, according to the network condition that the current network condition is in accordance with the indication policy, according to the network policy, which one or more frequency layer dispersion algorithms are used to send to the UE. Instructions. It is assumed that the embodiment instructs the UE to perform frequency layer dispersion using two algorithms, a pseudo-random function algorithm and a hash function algorithm.

Step 803, the UTRAN indicates the order of selection of the two algorithms of the UE. It is assumed that the present embodiment first uses a pseudo-random function algorithm and then uses a hash function algorithm for frequency layer dispersion.

Step 804: After receiving the foregoing indication, the UE determines, according to the indication, that all the algorithms are performed as an algorithm for performing frequency layer dispersion, and according to the selection order in the indication, first adopts a pseudo-random function algorithm to determine the dispersed frequency, and uses the determined The frequency is dispersed by the frequency layer; the hash function algorithm is used to determine the dispersed frequency, and the frequency layer is dispersed with the determined frequency. Of course, if there are too many frequency layer dispersion algorithms in the indication in the actual application, the UE may select some of the algorithms to perform frequency layer dispersion only according to the selection order, for example, one or two algorithms are selected to perform frequency layer dispersion.

Fifth preferred embodiment:

Referring to FIG. 9, FIG. 9 is a flow chart of the frequency layer dispersion process according to the fourth preferred embodiment of the present invention. The process includes the following steps:

Step 901: The UTRAN receives the session end request of the MBMS service sent by the CN, and determines that the frequency layer convergence operation is performed for the MBMS service, and then sends an indication message for performing the frequency layer scatter operation to the UE.

Step 902: The UTRAN determines, according to the network condition, the network condition indicating the current policy, and according to the network policy, the indication information of which one or more frequency layer dispersion algorithms are used is sent to the UE. It is assumed that the present embodiment instructs the UE to perform frequency layer dispersion using both the pseudo-random function algorithm and the hash function algorithm.

In step 903, the UTRAN indicates that the UEs of the cells adopt the pseudo-random function algorithm, and the UEs of other cells adopt the hash function algorithm. Step 904: After receiving the foregoing indication, the UE participates in the indication, and determines a frequency layer dispersion algorithm corresponding to the cell in which the UE is located as a frequency layer dispersion algorithm for performing frequency layer dispersion, and uses the algorithm to determine the dispersed frequency, and determine The frequency is dispersed by the frequency layer.

In this embodiment, the network side indicates different frequency layer decentralization algorithms for different cells. In actual applications, different frequency layer decentralization algorithms may also be indicated for UEs with different characteristics. For example: UEs of different states indicate different frequency layer dispersion algorithms.

It can be seen from the above embodiments that the user equipment in the multimedia broadcast/multicast service of the present invention performs the frequency layer decentralization method, thereby realizing the flexible selection of the UE and the use of the frequency layer decentralization algorithm, thereby adapting to different network conditions. At the same time, because the network side can control the direction of the UE's random selection, the distribution of the entire network user is more balanced.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope of the present invention. All should be covered by the scope of the present invention.

Claims

Claim

A method for performing frequency layer decentralization of user equipment in a multimedia broadcast/multicast service, characterized in that at least two frequency layer dispersion algorithms are stored in a user equipment UE, and the frequency layer dispersion process comprises the following steps:

A. When the network side needs to perform the frequency layer decentralization operation, the UE sends an indication of which one or which frequency layer dispersion algorithms are used to perform frequency layer dispersion;

B. The UE selects the frequency layer dispersion algorithm to perform frequency layer dispersion according to the instruction sent by the network side.

2. The method according to claim 1, wherein: the time required for the frequency layer decentralization operation is: in the process of transmitting multimedia broadcast/multicast service data on the network side; or in the multimedia broadcast/multicast service At the end of the session; or after a predetermined time at the end of the multimedia broadcast/multicast service session.

3. The method according to claim 1, wherein: in the step A, the network side sends to the UE whether to perform before or at the same time as the frequency layer dispersion algorithm is used to transmit to the UE. An indication of the dispersion of the frequency layer;

In step B, the UE first determines whether to perform frequency layer dispersion according to whether the frequency layer is dispersed or not; if yes, determines a frequency layer dispersion algorithm for performing frequency layer dispersion according to the indication, and finds and determines from the stored frequency layer dispersion algorithm. The frequency layer dispersion algorithm uses the frequency layer dispersion algorithm to perform frequency layer dispersion; otherwise, the frequency layer dispersion operation is not performed according to the indication.

The method according to claim 3, wherein: the method of transmitting to the user equipment UE whether to perform frequency dispersion, and indicating which one or which frequency layer dispersion algorithms are used by the UE to perform frequency layer dispersion is : Indicated in a control message or indicated by two control messages via a point-to-multipoint control channel or broadcast channel.

5. The method of claim 1 wherein: setting and storing more on the network side An indication policy, each of which includes: in which network case, which one or which frequency layer dispersion algorithms are used;

The method according to claim 5, wherein the network situation includes, but is not limited to, one or more of the following: a quantity and a distribution of a UE in a cell, a distribution of a cell, and a wide cell channel. Quantity, congestion, frequency usage of each cell, frequency planning.

7. The method according to claim 1, wherein: in step A, when the network side indicates which frequency layer dispersion algorithm is used by the UE to perform frequency layer dispersion, the frequency layer dispersion for performing frequency layer dispersion is determined in step B. The method of the algorithm is:

8. The method according to claim 7, wherein: the method for selecting a frequency layer dispersion algorithm from among several frequency layer dispersion algorithms in the indication is: randomly selecting or selecting in order of reception or pressing in advance The selection order of the settings is selected.

9. The method according to claim 8, wherein: when a frequency layer dispersion algorithm is randomly selected, a function algorithm capable of uniform selection is used to perform random selection.

10. The method according to claim 9, wherein: the function algorithm that can be uniformly selected is a hash algorithm or a random function algorithm.

The method according to claim 1, wherein: in step A, when the network side indicates which frequency layer decentralization algorithm is used by the UE to perform frequency layer dispersion, the UE further indicates the priority order of the UE or the UE. Which of the several frequency layer dispersion algorithms are used by the UEs selected from these algorithms or the selection rules or characteristics of the UE Frequency layer dispersion algorithm;

Step B determines the frequency of the implementation

The UE selects a frequency layer dispersion algorithm according to the priority selection order in the indication, and determines an algorithm for performing frequency layer dispersion; or determines which frequency layer dispersion algorithm should be used according to the selection condition or selection rule in the indication or according to its own condition, and selects A frequency layer dispersion algorithm is determined as an algorithm for performing frequency layer dispersion.

The method according to claim 11, wherein: the method for indicating which feature the UE separately uses which frequency layer decentralization algorithm of the frequency layer decentralization algorithms is: Different frequency layer dispersion algorithms;

In the step B, the UE determines that the frequency layer dispersion algorithm corresponding to the cell in which the cell is located is determined as a frequency layer dispersion algorithm for performing frequency layer dispersion.

The method according to claim 1, wherein: in step A, the network side indicates which frequency layer decentralization algorithm is used by the UE to perform frequency layer dispersion, and further indicates a selection order of the UEs;

14. The method according to claim 1, 3, 7, 11, 12 or 13, wherein: the method for indicating which one or which frequency layer dispersion algorithms are used by the UE for frequency layer dispersion is: The data indicates various frequency layer dispersion algorithms;

The method according to claim 1, wherein: step B further comprises: after receiving the indication, the UE performs one or more frequency layer dispersion algorithms in the indication separately Probability check; the frequency layer decentralization algorithm for performing frequency layer dispersion is determined by the frequency layer dispersion algorithm of the probabilistic face;

If the frequency layer dispersion algorithm in the indication does not pass the probability face, the UE randomly selects a frequency layer dispersion algorithm according to its own situation or a predetermined selection method.

The method according to claim 15, wherein the method for probabilistic checking is: the network side sends a check probability factor to the UE for each frequency layer decentralization algorithm in the indication; the UE receives the network side After the indication, a random number is generated for each frequency layer dispersion algorithm in the indication, and is respectively compared with a corresponding verification probability factor received from the network side, and if the random number is greater than the verification probability factor, the check is performed. Pass; otherwise the verification does not pass.

17. The method according to claim 16, wherein: the network side sends different check probability factors to the UE according to a predetermined priority or selection order for different frequency layer dispersion algorithms in the indication.

18. The method of claim 1, 3, 5, 7, 8, 9, 11, 12, 13, 15, 16, or 17, wherein the frequency layer dispersion algorithm includes but is not limited to the following algorithm: A pseudo-random function algorithm, a hash function algorithm, an algorithm for spreading frequencies to frequencies before frequency layer convergence, and a cell reselection algorithm.