CN101175258B - Method, base station and system for creating subframe in radio communication system - Google Patents
Method, base station and system for creating subframe in radio communication system Download PDFInfo
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Abstract
The present invention relates to a method, a base station and a system which realize the creation of a subframe in a wireless communication system. The method mainly includes two steps; firstly, after a newly joined base station determines that a subframe needs to be created, a neighboring base station needing to be added with the subframe is determined, the main subframe number of the newly joined base station and the neighboring base station needing to be added with the subframe is determined; secondly, the newly joined base station carrying the determined main subframe number sends a subframe creation request to the neighboring base station needing to be added with the subframe and is interacted with the neighboring base station in order to fulfil the process of subframe creation. The present invention provides the whole process of creating and selecting a subframe, moreover, because the present invention restricts the creation of a new subframe in the neighboring base station of a new base station, the present invention can effectively reduce the load of the system, that is, the processing load of base stations is reduced, therefore the realization of base stations is relatively simple, and meanwhile, the utilization rate of system resources can also be effectively increased.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a scheme for realizing subframe creation.
Background
In order to improve the spectrum efficiency of a wireless communication system and avoid interference, the IEEE 802.16h standard proposes an implementation scheme adopting a subframe structure. With the corresponding subframe structure, one MAC (medium access control) frame resource can be shared between different systems (simply, systems composed of a BS and an SS) composed of a BS (base station) and an SS (user) associated therewith.
The subframe structure is specifically to divide one frame of the MAC frame into two parts of subframes: a part of the subframes are used for transmitting data without interference, which are called common subframes, and another part of the subframes are used for transmitting data with interference, which are called interference subframes. In order to avoid interference, a subframe for transmitting data with interference is periodically and uniquely assigned to a system composed of a BS and an SS, and is referred to as a primary subframe of the system, and other time intervals in parallel with the primary subframe are referred to as secondary subframes.
In a wireless communication system, the structure of the system changes due to system upgrade or capacity expansion. When a new base station enters the network, if it is determined that it must share the same channel with its neighbor base stations, it is first required to try to obtain an idle subframe without increasing the number of subframes. If an idle subframe can not be obtained from the existing subframes as the main subframe of the new base station, the new base station requests to increase the number of subframes. I.e. a new subframe creation operation is required so that the newly added base station can obtain the corresponding primary subframe.
Currently, the new subframe creation method provided by the IEEE 802.16h standard is as follows:
(1) firstly, a newly added base station sends a new subframe creation request to all BSs in a community composed of a plurality of BSs and solving the interference problem through an IP message, wherein the request comprises the following steps: operator ID and base station ID, effective MAC frame number of new subframe, etc.;
(2) all the requested base stations respond to the subframe creation request of the newly added base station, and the response can be specifically carried out in the following way:
a. replying an MAC frame number containing a changed subframe structure and a main subframe number which can be adopted by a newly added base station, wherein the frame number is required to be the same as the MAC frame number requested by the newly added base station;
b. for the base station without confirmation, the newly joining base station will send a plurality of requests to the base station, if the base station has not been confirmed after sending the plurality of requests, other methods should be adopted or the neighbor base station is considered to be incompatible with the wireless MAN-CX (coexisting wireless metropolitan area network) system.
In the set MAC frame, a new subframe division method is to be adopted according to the subframe creation request, that is, a new subframe is inserted in a manner that N is N +1, where N is the number of subframes other than the common subframe.
(3) The newly added base station can start to use the newly created main subframe after receiving the corresponding confirmation.
The subframe creating method provided by the prior art has the following two problems:
the problem of the first aspect is: the new base station sends a new subframe creation request to all base stations in the corresponding community, which reduces the utilization rate of system resources and increases the system load.
Taking the community described in fig. 1 as an example, it is assumed that there are 3 base stations A, B, C in the initial community, and the subframe structure adopted by the base stations is as shown in fig. 1, where N is 2;
assuming that a base station D enters a community as a newly added base station and interference neighbors of the base station D are a base station a and a base station B, as shown in fig. 2, a subframe creation process according to the prior art includes:
as the base station D enters, each base station needs to increase the number of subframes, that is, to create a new subframe, for this reason, the base station D needs to send a new subframe creation request to the base stations A, B and C;
since the base station D can detect that the base stations a and B are neighbors of itself but cannot detect the base station C, the base station D needs to forward a corresponding new subframe creation request to the base station C through the base station B, which obviously increases the signaling load of each base station and also increases the implementation complexity thereof.
Moreover, if the base station C also adopts the updated subframe structure, as shown in fig. 3, the base station C may select subframe 1 or subframe 3 as the primary subframe, but it cannot actually select two subframes as the primary subframes, and therefore, the system resource utilization rate is reduced.
The second aspect has the problems that: in the process of creating a new subframe, a mode that each base station and a newly added base station select a main subframe is not given, so that after the new subframe is created, each base station cannot conveniently select the main subframe which can meet the communication requirement, and therefore, the problem that the whole process of creating the subframe is not completely realized in the process of creating the new subframe provided by the prior art exists.
Disclosure of Invention
The invention aims to provide a method, a base station and a system for realizing subframe establishment in a wireless communication system, thereby improving the utilization rate of system resources and reducing the signaling burden of the system.
The purpose of the invention is realized by the following technical scheme:
the invention provides a method for realizing subframe establishment in a wireless communication system, which comprises the following steps:
after the newly added base station determines that the subframe needs to be created, determining a neighbor base station needing to add the subframe, and determining the main subframe number of the newly added base station and the neighbor base station needing to add the subframe;
and the newly added base station sends a subframe establishing request to a neighbor base station needing to add the subframe, wherein the establishing request carries the determined main subframe number, and the newly added base station carries out information interaction with the neighbor base station to complete the subframe establishing process.
Optionally, after the newly joining base station sends a subframe creation request to the neighbor base station, the method further includes: the newly joining base station sends a notice of canceling a new subframe creation request to the neighbor base station, and the neighbor base station receiving the notice cancels the subframe creation for the newly joining base station and restores the structure of the atomic frame.
Optionally, the notification of canceling the new subframe creation request includes at least one of:
operator identification, base station channel number, and subframe number.
Optionally, the subframe creation request carries at least one of the following main subframe numbers determined by the newly added base station:
operator identification, base station channel number, number of new interference subframes, subframe creation effective frame number, subframe allocation type, and repetition interval between two primary subframes.
Optionally, the method further comprises:
the neighbor base station receiving the subframe establishing request receives the subframe establishing request, establishes an effective frame in the subframe, and establishes a new subframe by adopting a new interference subframe number and a new main subframe number;
or,
and the neighbor base station receiving the subframe creation request returns a rejection response to the newly added base station, and the rejection response comprises a rejection reason.
Optionally, the process of determining the neighbor base station needing to add subframes includes:
determining a new interference subframe number after the subframe is created, wherein if the number of interference subframes adopted by each neighbor base station of the newly added base station is not equal, the new interference subframe number is the maximum value of the interference subframe numbers of all the neighbor base stations, and if the number of interference subframes adopted by each neighbor base station of the newly added base station is the same, the new interference subframe number is the number of interference subframes adopted by the neighbor base stations plus 1;
and in all the neighbor base stations, the neighbor base station which adopts the interference subframe number smaller than the new interference subframe number is the neighbor base station which needs to increase the subframes.
Optionally, the process of determining the main subframe numbers of the newly added base station and the neighbor base stations needing to add subframes may be, specifically,
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station before is the same, the method comprises the following steps:
the neighbor base station selects the first subframe and the last subframe as own main subframes according to the original main subframe selection sequence; then newly adding a base station to select an idle subframe as a main subframe of the base station;
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station is different, the method comprises the following steps:
selecting a main subframe number determined according to the main subframe number adopted before for the neighbor base station with the interference subframe number larger than 1 and smaller than the new interference subframe number; and finally, determining the main subframe number which can be adopted by the neighbor base station with the interference subframe number of 1 for the previously adopted interference subframe.
The present invention also provides a system for implementing subframe creation in a wireless communication system, including a newly joining base station and a neighbor base station, wherein,
the newly-added base station is used for determining a neighbor base station needing to add the subframe, determining the main subframe number of the newly-added base station and the neighbor base station needing to add the subframe, and then sending a subframe creation request to the neighbor base station needing to add the subframe;
the neighbor base station is used for returning response information to the newly added base station after receiving the subframe establishing request;
the present invention also provides a base station for a new joining base station as an initiatable frame creation, comprising a subframe creation request transmitting unit and a main subframe selecting unit, wherein,
the main subframe selection unit is used for determining a neighbor base station needing to add subframes and determining main subframe numbers of a newly added base station and the neighbor base station needing to add subframes;
and the subframe creation request sending unit is used for sending a subframe creation request to the neighbor base station needing to add the subframe by carrying the determined main subframe number of the main subframe selecting unit.
Optionally, the base station further includes a cancel subframe creation initiating unit, configured to send a notification of canceling the new subframe creation request to the neighbor base station, and notify the neighbor base station of canceling the new subframe creation.
Optionally, the main subframe selecting unit specifically includes:
a new interference subframe number determining unit, configured to determine a new interference subframe number after the subframe is created, where the new interference subframe number is a maximum value of interference subframe numbers of all neighbor base stations if the interference subframe numbers adopted by the neighbor base stations newly added to the base station before are not equal to each other, and otherwise, the new interference subframe number is a sum of 1 and the interference subframe number adopted before;
the neighbor base station determining unit is used for determining the neighbor base station with the number of the interference subframes smaller than the number of the new interference subframes in all the neighbor base stations and taking the neighbor base station as the neighbor base station with the subframes needing to be added;
and the main subframe determining unit is used for selecting and determining the main subframe which can be adopted by each neighbor base station and the newly added base station according to the number of interference subframes and the main subframe number which are adopted by the neighbor base station of the newly added base station before.
Optionally, the main subframe determining unit specifically includes:
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station before is the same, the method comprises the following steps:
a first neighbor base station main subframe determining subunit, wherein the neighbor base station selects a first subframe and a last subframe as own main subframes according to the original main subframe selection sequence;
a main subframe determining subunit of a first newly added base station, wherein the newly added base station selects an idle subframe as a main subframe of the newly added base station;
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station is different, the method comprises the following steps:
the second neighbor base station main subframe determining subunit determines the neighbor base station of which the number of the interference subframes adopted before is more than 1 and less than the number of the new interference subframes, and takes the main subframe number adopted before as the main subframe number determined by the neighbor base station;
the second new base station main subframe determining subunit selects an idle subframe for the new base station as the main subframe of the second new base station after the second neighbor base station main subframe determining subunit completes the operation;
and the third neighbor base station main subframe determining subunit determines the main subframe number which can be adopted by the neighbor base station with the interference subframe number of 1 for the previous adopted interference subframe after the second neighbor base station main subframe determining subunit and the second newly-added base station main subframe determining subunit complete the operation.
Optionally, the base station further includes:
a subframe creation confirmation unit, configured to receive a rejection response or an acceptance response signal of the requested neighbor base station, and if an acceptance response returned by each neighbor base station is received, create a new subframe in the subframe creation validation frame; and if a rejection response is received or no response is received, retransmitting the subframe creation request or canceling the creation of a new subframe.
The present invention also provides a base station, which is used as the neighbor base station of the base station, and comprises:
the subframe creation response unit is used for determining to accept or reject the request after receiving the subframe creation request of the newly added base station and returning rejection response or acceptance response information to the newly added base station;
and the subframe creation processing unit is used for triggering after the subframe creation response unit determines to accept the received subframe creation request so as to perform the creation operation of a new subframe.
Optionally, the base station further includes a cancel subframe creation processing unit, configured to cancel, after receiving a notification of a cancel new subframe creation request sent by a newly added base station, the subframe creation for the newly added base station, and restore the atomic frame structure.
According to the technical scheme provided by the invention, the complete subframe creating and selecting process is provided, and the new subframe is specifically defined in the neighbor base station of the new base station instead of all base stations in the community, so that the load of the system can be effectively reduced, namely the processing load of the base station is reduced, and the base station is relatively simple to realize; meanwhile, the invention enables the non-neighbor base station to keep the original subframe structure for communication, thereby further effectively improving the utilization rate of system resources.
Drawings
FIG. 1 is a diagram illustrating an initial community structure and its adopted sub-frame structure;
FIG. 2 is a schematic structural diagram of a base station D joining the community shown in FIG. 1;
FIG. 3 is a schematic diagram of a subframe structure after base station D is added;
FIG. 4 is a diagram illustrating a first type of subframe structure;
FIG. 5 is a diagram illustrating a second type of subframe structure;
FIG. 6a is a diagram of a specific implementation structure of a base station and a system for implementing subframe creation according to the present invention;
fig. 6b is a schematic diagram of a specific implementation structure of the main subframe determination unit;
fig. 6c is a schematic diagram of a specific implementation structure of the main subframe determination unit;
fig. 7 is a schematic diagram of a subframe structure after the base station D according to the present invention is added.
Detailed Description
In a wireless communication system, after a newly added base station determines that no idle available subframes exist, the newly added base station needs to create new subframes. In the implementation scheme for implementing the subframe creation in the wireless communication system, for a newly added base station, firstly, neighbor base stations needing to be added with subframes are determined in all neighbor base stations, and main subframe numbers adopted by the newly added base station and the neighbor base stations needing to be added with subframes are further determined, and then, a subframe creation request is sent to the neighbor base stations needing to be added with the corresponding main subframe numbers only, and the subframe creation request is not sent to other base stations in a community. And then, after receiving the subframe creating request, the neighbor base station needing to add the subframe interacts information with the newly added base station so as to realize the subframe creating process aiming at the newly added base station.
Because the number of interference subframes adopted by all neighbor base stations newly added to the base station is not necessarily the same, the newly added base station needs to determine the number of new interference subframes after the subframes are created according to the number of interference subframes adopted by all neighbor base stations before, and the specific mode is as follows:
if the number of interference subframes adopted by each neighbor base station of the newly added base station is not equal, for example, the number of interference subframes adopted by some neighbor base stations is 2, and the number of interference subframes adopted by some neighbor base stations is 3, the number of new interference subframes is the maximum value of the number of interference subframes of all neighbor base stations, that is, the number of new interference subframes in this example is 3;
if the number of the interference subframes adopted by each neighbor base station of the newly added base station is the same, the number of the new interference subframes is the number of the interference subframes adopted by the newly added base station plus 1.
Currently, in a community including a plurality of base stations, there are two types of corresponding subframe partitions,
the first type (i.e., type 1) of subframe structure is shown in fig. 4, specifically, Tx (transmission) and Rx (reception) of each MAC frame are divided into N +1 subframes, where: one subframe is used for non-interference services, called a common subframe, and each of the remaining N subframes (called interference subframes) is allocated to each base station in the community as its primary subframe; for the main subframe, only the base station with the main subframe can receive and transmit information, and other base stations do not interfere the main subframe, so that the main subframe is called as an auxiliary subframe; and N is the number of interference subframes.
When N is 3, the subframe structure of type 1 is given in fig. 4, the common subframe is used for non-interference traffic, the primary subframes of the system A, B, C are the primary subframes of the base station A, B, C, and the secondary subframes of the system A, B, C are the secondary subframes of the base station A, B, C.
The second type (i.e. type 2) of subframe structure is shown in fig. 5, specifically, Tx and Rx of each MAC frame are divided into 2 subframes, where: one for non-interfering traffic (common subframes) and the other (interfering subframes) can be used by one base station as a primary subframe, one period every N frames; similarly, for the main subframe, only the base station having the main subframe can perform the transceiving operation of the information, and no other base station causes interference to the main subframe.
In fig. 5, a subframe structure of type 2 when N is 3 is given, and similarly, subframes other than the common subframe are defined as interference subframes, and interference subframes within one period are numbered from 1 to N; as in fig. 4, the common subframe is used for non-interference traffic, the system A, B, C primary subframes are respectively primary subframes of the base station A, B, C, and the system A, B, C secondary subframes are respectively secondary subframes of the base station A, B, C.
In conjunction with the different types of subframe structures described above in fig. 4 and 5, the present invention provides two specific embodiments of new subframe creation procedures.
Firstly, the subframe creating process provided by the invention based on the subframe structure of the first type comprises the following steps:
a newly added base station sends a new subframe establishing request to a neighbor base station of the newly added base station needing to add subframes through IP information, and other base stations in a community do not need to send corresponding requests to the base stations;
the sent new subframe creation request message may include, but is not limited to: the method comprises the following steps that at least one item of information such as an operator ID, a base station ID, an effective MAC frame number (a subframe creation effective frame number) of a new subframe, the number of interference subframes (namely a new interference subframe number) required to be created, the main subframe number of a neighbor base station, a channel (a base station channel number) adopted by the base station required to be created, a repetition interval between two main subframes, a subframe distribution type and the like is selected;
the neighbor base station needing to increase the subframes specifically comprises the following two conditions:
(1) if the number of the interference subframes adopted by all the neighbor base stations before is the same, the neighbor base stations needing to increase the subframes refer to all the neighbor base stations newly added into the base station;
(2) if the number of the interference subframes adopted by the neighbor base station before is different, the neighbor base station needing to increase the subframes refers to all the neighbor base stations of which the number of the interference subframes adopted before is smaller than the number of the new interference subframes determined by the newly added base station;
in the step (one), the newly added base station needs to select and determine the number of the main subframe that can be used by the newly added base station for the neighbor base station that needs to add the subframe, taking the number of the interference subframes less than 3 as an example, the following two cases can be specifically distinguished, which are respectively:
(1) the interference subframes adopted before all the neighbor base stations newly added into the base station are the same in number
If the number N of the interference subframes is 2 after the new subframe is created, the requested neighbor base station selects the first subframe as the main subframe of the requested neighbor base station;
if the number of the interference sub-frames N is 3 after the new sub-frame is created, the two corresponding neighbor base stations sequentially select the first sub-frame and the last sub-frame as their main sub-frames according to the atomic frame selection sequence, specifically: if the requested neighbor base station selects the first subframe as the main subframe before the new subframe is created, the requested neighbor base station selects the first subframe in the new subframe structure as the main subframe after the new subframe is created; if the requested neighbor base station selects the last subframe as the main subframe of the requested neighbor base station before the new subframe is created, the requested neighbor base station still selects the last subframe in the new subframe structure as the main subframe of the requested neighbor base station after the new subframe is created;
(2) the number of interference subframes adopted before all the neighbor base stations newly added into the base station is different
1. Maintaining a master subframe number of a neighbor base station having a new interference subframe number or greater unchanged;
2. selecting and determining a corresponding main subframe number for the neighbor base station with the number of the interference subframe adopted before being more than 1 and less than the new interference subframe number;
taking the example that the number of interference subframes of the neighbor base station is increased from 2 to 3, if the requested base station selects the first subframe as the main subframe of the requested base station before the new subframe is created, the requested base station selects the first subframe in the new subframe structure as the main subframe of the requested base station after the new subframe is created; if the requested base station selects the last subframe as the main subframe of the requested base station before the new subframe is created, the requested base station selects the last subframe in the new subframe structure as the main subframe of the requested base station after the new subframe is created;
if the neighbor base station with the number of the interference sub-frames which is adopted before and is more than 1 and less than the new interference sub-frame number does not exist, skipping the process and directly executing the subsequent step 3;
3. a newly added base station selects an idle subframe as a subframe of the newly added base station;
4. if the neighbor base station with the interference subframe number of 1 adopted before exists, the master subframe number which can be adopted by the neighbor base station is distributed to the neighbor base station.
(II) the requested neighbor base station responds to the newly added base station, and the specific response mode comprises the following steps:
(1) if the neighbor base station rejects the new subframe creation request of the newly added base station, feeding back the rejection request to the newly added base station, and simultaneously informing the newly added base station of the rejection reason;
(2) if the neighbor base station receives the new subframe establishing request of the newly added base station, replying an acceptance response to the newly added base station; the response message may include, but is not limited to: at least one item of information such as the effective MAC frame number of the new subframe, the number of main subframes adopted by the newly added base station (namely the number of main subframes adopted by the newly added base station after the main subframe creating message takes effect), the main subframe selected by the neighbor base station (the main subframe is distributed by the newly added base station), and the like; wherein, the effective MAC frame number of the new subframe must be the same as the MAC frame number requested by the newly joined base station.
At the MAC frame with the new subframe in effect, the new base station and the neighbor base station start to use the newly created subframe to carry out information transceiving operation.
In the above-mentioned process (two), for the neighbor base station that is not confirmed, the newly added base station will send a new subframe creation request to this neighbor base station for many times, and if the neighbor base station is not confirmed after sending for many times, another method (e.g., a method of cognitive wireless signaling) should be adopted for retry or the neighbor base station is considered to be incompatible with the WirelessMAN-CX system.
The invention also provides the operation that the newly added base station cancels the creation process of the new subframe. That is, if during the process of the neighbor base station performing the new subframe creation process, before the new subframe becomes effective, the newly joining base station may transmit a notification of canceling the new subframe creation request to cancel the creation of the new subframe of the corresponding neighbor base station. The reason for canceling the creation of the new subframe may be because a reject response of the neighbor base station is received or because of other reasons, and the cancellation reason is not limited in the present invention.
If the newly added base station needs to cancel the new subframe creation, the newly added base station will send a notification of canceling the new subframe creation request through an IP message to notify all neighbor base stations or some neighbor base stations of canceling the new subframe creation request, where the notification message of canceling the new subframe creation request may include, but is not limited to: operator ID, base station ID, and base station channel number, number of subframes, etc.
It should be noted that the subframe creation process provided by the present invention is also applicable to the creation operation of a new subframe based on the subframe structure of the second type, and the corresponding specific implementation process is similar to the aforementioned subframe creation process based on the subframe structure of the first type, and therefore, the description thereof is omitted here.
The invention also provides a system for realizing the subframe establishment in the wireless communication system, which comprises a newly added base station and a neighbor base station, and the specific realization structure is shown in figure 6a and respectively comprises the following steps:
(1) a newly added base station sends a subframe establishing request to a neighbor base station needing to add subframes;
the newly added base station may specifically include a subframe creation request sending unit and a main subframe selecting unit, wherein,
a subframe creation request sending unit, configured to send, when a new base station joins, a subframe creation request to a neighbor base station that needs to add a subframe on behalf of the newly joined base station, where information carried in the request message is described above and is not described herein again;
the main subframe selection unit is used for determining the neighbor base stations needing to increase the subframes according to the number of interference subframes adopted by each neighbor base station before, selecting the corresponding main subframes for the neighbor base stations needing to increase the subframes according to the main subframe numbers adopted by the neighbor base stations, and selecting the corresponding main subframe numbers for the newly added base stations;
the main subframe selection unit may specifically include the following processing units:
a new interference subframe number determining unit, configured to determine a new interference subframe number after the subframe is created, specifically: if the number of the interference subframes adopted by each neighbor base station of the newly added base station is not equal, the number of the new interference subframes is the maximum value of the number of the interference subframes of all the neighbor base stations, otherwise, the number of the interference subframes adopted by each neighbor base station of the newly added base station is equal, and the number of the new interference subframes is the number of the interference subframes adopted by the newly added base station plus 1.
And the neighbor base station determining unit is used for determining the neighbor base stations with the number of the interference subframes smaller than the new interference subframe number in all the neighbor base stations, and taking each neighbor base station meeting the conditions as the neighbor base station needing to increase the subframes.
A main subframe determining unit, configured to select and determine a main subframe that can be used by each neighbor base station and a newly added base station according to a number of interference subframes and a main subframe number that are used by the neighbor base station that newly added to the base station before; the specific processing procedure of the main subframe determination unit may include the following two cases:
the first case is: if the number of the interference subframes adopted by all the neighbor base stations before is the same, as shown in fig. 6b, the method specifically includes:
a first neighbor base station main subframe determining subunit, wherein the neighbor base station selects a first subframe and a last subframe as own main subframes according to the original main subframe selection sequence;
and the new base station selects an idle subframe as the main subframe of the new base station.
For example, the corresponding processing method may be:
1. if the number of subframes after the new subframe is created is 2, the neighbor base station selects the first subframe as the main subframe of the neighbor base station; or,
2. if the number of subframes after the new subframe is created is 3, the corresponding two neighbor base stations sequentially select a first subframe and a last subframe as own main subframes according to the atomic frame selection sequence;
the second case is: if the number of interference subframes adopted by all neighboring base stations before is different, as shown in fig. 6c, the method specifically includes:
the second neighbor base station main subframe determining subunit determines the neighbor base station of which the number of the interference subframes adopted before is more than 1 and less than the number of the new interference subframes, and takes the main subframe number adopted before as the main subframe number determined by the neighbor base station;
the second new base station main subframe determining subunit selects an idle subframe for the new base station as the main subframe of the second new base station after the second neighbor base station main subframe determining subunit completes the operation;
and the third neighbor base station main subframe determining subunit determines the main subframe number which can be adopted by the neighbor base station with the interference subframe number of 1 for the previous adopted interference subframe after the second neighbor base station main subframe determining subunit and the second newly-added base station main subframe determining subunit complete the operation.
For example, the corresponding processing manner may include:
1. maintaining a master subframe number of a neighbor base station having a new interference subframe number or greater unchanged;
2. selecting and determining a corresponding main subframe number for the neighbor base station with the number of the interference subframe adopted before being more than 1 and less than the new interference subframe number;
if the neighbor base station with the number of the interference sub-frames which is adopted before and is more than 1 and less than the new interference sub-frame number does not exist, skipping the process and directly executing the subsequent step 3;
3. a newly added base station selects an idle subframe as a subframe of the newly added base station;
4. if the neighbor base station with the interference subframe number of 1 adopted before exists, the master subframe number which can be adopted by the neighbor base station is distributed to the neighbor base station.
The newly added base station can also comprise a subframe establishing and confirming unit which is used for receiving the rejection response or acceptance response signal of the requested neighbor base station and confirming the subframe establishing process; if all the requested neighbor base stations return a response of accepting the subframe creation request, creating a new subframe in the subframe creation effective frame; if some requested neighbor base stations transmit rejection responses or do not receive response signals of the requested neighbor base stations, it may be selected to notify the subframe creation request transmitting unit to re-transmit a subframe creation request to the requested neighbor base stations or to notify the cancellation of the subframe creation initiating unit to cancel creation of new subframes, and so on, as the case may be.
In order to cancel the new subframe creation, the newly joining base station may further include a cancel subframe creation initiating unit, configured to send a notification of a cancel new subframe creation request to all or some of the neighbor base stations, so as to notify the neighbor base stations of canceling the new subframe creation.
(2) The neighbor base station is used for establishing a new subframe after receiving the subframe establishing request and returning response information;
moreover, the neighbor base station may specifically include a subframe creation response unit and a subframe creation processing unit, wherein,
the subframe creation response unit is configured to determine to accept or reject the subframe creation request after receiving the subframe creation request of the newly added base station, and return a reject response or accept response information to the newly added base station, where information specifically included in the accept response or reject message is described above and is not described herein again;
the subframe creation processing unit is used for triggering after receiving a subframe creation request of a newly added base station so as to perform the creation operation of a new subframe.
The neighbor base station also comprises a canceling subframe creation processing unit, corresponding to the structure of the newly added base station, for canceling the subframe creation aiming at the newly added base station and recovering the atomic frame structure after receiving the notification of the canceling new subframe creation request sent by the newly added base station.
It should be noted that the base station may include the processing units included in the newly added base station and the neighboring base station in the implementation process, and this is also within the scope of the present invention.
It can be seen from the above implementation scheme of new subframe creation provided by the present invention that the present invention not only provides a complete processing procedure of new subframe creation, but also reduces the load and improves the resource utilization rate. As shown in fig. 7:
when the base station D enters the network and sends a new subframe creation request to the base station a and the base station B, the base station C does not need to accept the new subframe creation request, that is, the base station C can maintain the subframe structure of the base station D before entering unchanged, so that interference is not generated.
Therefore, compared with the prior art, the invention does not need the base station B to forward the new subframe creation request to the base station C, which inevitably reduces the signaling load between the base station B and the base station C. Meanwhile, the base station C maintains the previous frame structure unchanged, so that the resource utilization rate is also obviously improved compared with the prior art.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (15)
1. A method for implementing subframe creation in a wireless communication system, comprising:
after determining that the subframes need to be created, the newly added base station determines neighbor base stations needing to be added with the subframes, and determines main subframe numbers of the newly added base station and the neighbor base stations needing to be added with the subframes;
and the newly added base station sends a subframe establishing request to the neighbor base station needing to increase the subframes, wherein the establishing request carries the determined main subframe number, and the newly added base station and the neighbor base station carry out information interaction to complete the subframe establishing process.
2. The method of claim 1, wherein after the newly joining base station sends a subframe creation request to the neighbor base station, the method further comprises:
and the newly added base station sends a notice of canceling a new subframe creating request to the neighbor base station, and the neighbor base station which receives the notice cancels the subframe creating aiming at the newly added base station and restores the structure of the atomic frame.
3. The method of claim 2, wherein the notification to cancel the new subframe creation request comprises at least one of:
operator identification, base station channel number, and subframe number.
4. The method of claim 1, wherein the subframe creation request, in addition to carrying the primary subframe number determined by the newly added base station, further comprises at least one of the following:
operator identification, base station channel number, number of new interference subframes, subframe creation effective frame number, subframe allocation type, and repetition interval between two primary subframes.
5. The method of claim 1, further comprising:
the neighbor base station receiving the subframe establishing request receives the subframe establishing request, establishes an effective frame in the subframe, and establishes a new subframe by adopting a new interference subframe number and a new main subframe number;
or,
and the neighbor base station receiving the subframe creation request returns a rejection response to the newly added base station, and the rejection response contains a rejection reason.
6. The method according to any of claims 1 to 5, wherein the process of determining the neighbor base stations that need to add subframes comprises:
determining a new interference subframe number after the subframe is created, wherein if the number of interference subframes adopted by each neighbor base station of the newly added base station is not equal, the new interference subframe number is the maximum value of the interference subframe numbers of all the neighbor base stations, and if the number of interference subframes adopted by each neighbor base station of the newly added base station is the same, the new interference subframe number is the number of interference subframes adopted by the neighbor base stations plus 1;
and in all the neighbor base stations, the neighbor base station which adopts the interference subframe number smaller than the new interference subframe number is the neighbor base station which needs to increase the subframes.
7. The method according to claim 6, wherein the process of determining the primary subframe numbers of the newly added base station and the neighbor base stations that need to add subframes, in particular,
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station before is the same, the method comprises the following steps:
the neighbor base station selects the first subframe and the last subframe as own main subframes according to the original main subframe selection sequence; then newly adding a base station to select an idle subframe as a main subframe of the base station;
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station is different, the method comprises the following steps:
selecting a main subframe number determined according to the main subframe number adopted before as a neighbor base station of which the number of the interference subframe adopted before is more than 1 and less than the new interference subframe number; and finally, determining the main subframe number which can be adopted by the neighbor base station with the interference subframe number of 1 for the previously adopted interference subframe.
8. A system for implementing subframe creation in a wireless communication system, including a newly joining base station and a neighbor base station,
the newly-added base station is used for determining a neighbor base station needing to add the subframe, determining the main subframe number of the newly-added base station and the neighbor base station needing to add the subframe, and then sending a subframe creation request to the neighbor base station needing to add the subframe, wherein the creation request carries the determined main subframe number;
and the neighbor base station is used for returning response information to the newly added base station after receiving the subframe establishing request.
9. A base station for a new joining base station as an initiatable frame creation, comprising a subframe creation request transmission unit and a main subframe selection unit, wherein,
the main subframe selection unit is used for determining a neighbor base station needing to add subframes and determining main subframe numbers of a newly added base station and the neighbor base station needing to add subframes;
and the subframe creation request sending unit is used for sending a subframe creation request to the neighbor base station needing to increase the subframes, and the subframe creation request carries the main subframe number determined by the main subframe selecting unit.
10. The base station of claim 9, wherein the base station further comprises:
and the cancellation subframe creation initiating unit is used for sending a notification of a cancellation new subframe creation request to the neighbor base station and notifying the neighbor base station of cancellation of new subframe creation.
11. The base station according to claim 9 or 10, wherein the main subframe selecting unit specifically comprises:
a new interference subframe number determining unit, configured to determine a new interference subframe number after the subframe is created, where the new interference subframe number is a maximum value of interference subframe numbers of all neighbor base stations if the interference subframe numbers adopted by the neighbor base stations newly added to the base station before are not equal to each other, and otherwise, the new interference subframe number is a sum of 1 and the interference subframe number adopted before;
the neighbor base station determining unit is used for determining the neighbor base station with the number of the interference subframes smaller than the number of the new interference subframes in all the neighbor base stations and taking the neighbor base station as the neighbor base station with the subframes needing to be added;
and the main subframe determining unit is used for selecting and determining the main subframe which can be adopted by each neighbor base station and the newly added base station according to the number of interference subframes and the main subframe number which are adopted by the neighbor base station of the newly added base station before.
12. The base station of claim 11, wherein the processing specifically performed by the primary subframe determination unit comprises:
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station before is the same, the method comprises the following steps:
a first neighbor base station main subframe determining subunit, wherein the neighbor base station selects a first subframe and a last subframe as own main subframes according to the original main subframe selection sequence;
a main subframe determining subunit of a first newly added base station, wherein the newly added base station selects an idle subframe as a main subframe of the newly added base station;
if the number of interference subframes adopted by the neighbor base station which is newly added into the base station is different, the method comprises the following steps:
the second neighbor base station main subframe determining subunit determines the neighbor base station of which the number of the interference subframes adopted before is more than 1 and less than the number of the new interference subframes, and takes the main subframe number adopted before as the main subframe number determined by the neighbor base station;
the second new base station main subframe determining subunit selects an idle subframe for the new base station as the main subframe of the second new base station after the second neighbor base station main subframe determining subunit completes the operation;
and the third neighbor base station main subframe determining subunit determines the main subframe number which can be adopted by the neighbor base station with the interference subframe number of 1 for the previous adopted interference subframe after the second neighbor base station main subframe determining subunit and the second newly-added base station main subframe determining subunit complete the operation.
13. The base station according to claim 9 or 10, wherein said base station further comprises:
a subframe creation confirmation unit, configured to receive a rejection response or an acceptance response signal of the requested neighbor base station, and create a new subframe in the subframe creation effective frame if an acceptance response returned by each neighbor base station is received; and if a rejection response is received or no response is received, retransmitting the subframe creation request or canceling the creation of a new subframe.
14. A base station for use as a neighbour base station for a base station as claimed in any one of claims 9 to 13, comprising:
the subframe creation response unit is used for determining to accept or reject the request after receiving the subframe creation request of the newly added base station and returning rejection response or acceptance response information to the newly added base station;
and the subframe creation processing unit is used for triggering after the subframe creation response unit determines to accept the received subframe creation request so as to perform the creation operation of a new subframe.
15. The base station of claim 14, wherein the base station further comprises:
and the cancellation subframe creation processing unit is used for canceling the subframe creation aiming at the newly added base station and recovering the atomic frame structure after receiving the notification of the cancellation new subframe creation request sent by the newly added base station.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378723A (en) * | 2000-06-05 | 2002-11-06 | 连宇通信有限公司 | Framing method are synchronous wireless system therewith |
| CN1525782A (en) * | 2003-02-27 | 2004-09-01 | 西门子移动通讯公司 | Radio resource management method in cellular telephone networks |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1378723A (en) * | 2000-06-05 | 2002-11-06 | 连宇通信有限公司 | Framing method are synchronous wireless system therewith |
| CN1525782A (en) * | 2003-02-27 | 2004-09-01 | 西门子移动通讯公司 | Radio resource management method in cellular telephone networks |
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| Title |
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| Matiana Goldhamer.802.16h main concepts, as reflected by IEEE 802.16-05/22.《IEEE C802.16h-05/045》.2005, * |
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