CN102883331B - Network coverage method, base station, network accessing method, and base station - Google Patents

Network coverage method, base station, network accessing method, and base station Download PDF

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Publication number
CN102883331B
CN102883331B CN201110192627.8A CN201110192627A CN102883331B CN 102883331 B CN102883331 B CN 102883331B CN 201110192627 A CN201110192627 A CN 201110192627A CN 102883331 B CN102883331 B CN 102883331B
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network
covered
layer network
terminal
ground floor
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CN102883331A (en
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王文明
张志敏
石伟
李智伟
杜建凤
盛凌志
赵伟
刘桓
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China Mobile Group Beijing Co Ltd
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China Mobile Group Beijing Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the invention provides a network coverage method, a base station, a network accessing method, and a base station; the network coverage method comprises the following steps: when performing network coverage, on the basis that a continuously covered first layer of network is established by using a differ-frequency networking scheme, and establishing a discontinuously covered second layer of same-frequency network by using frequency band which is different from each frequency band of the first layer of network, thereby improving the communication property of users at cell edge and meanwhile giving consideration to the handling capacity of whole network. The embodiment of the invention further provides a scheme for accessing the network which is formed by the above network coverage scheme.

Description

The method of network coverage method, base station and access network, base station
Technical field
The present invention relates to moving communicating field, particularly relate to a kind of network coverage method, the method for base station and access network, base station.
Background technology
According to third generation partner program (third generation partnership project, 3GPP) agreement regulation, for G mobile communication (3rd-generation, 3G) and follow-up technical standard, as Long Term Evolution (the TD-SCDMA Long Term Evolution of TD-SCDMA, TD-LTE) technology, the frequency duplex factor as one of network can be 1, namely network can realize the whole network identical networking, utilizes identical networking technology can obtain the higher availability of frequency spectrum.But according to existing simulation result, after identical networking, due to the impact of co-channel interference between each neighbor cell, at each cell edge, the communication performance of user declines serious, causes the communication performance of whole network to be affected thus.
For the problem of co-channel interference that identical networking exists, prior art provides a kind of frequency shift channeling (Frequency Shifted Frequency Reuse, FSFR) networking plan.In FSFR networking plan, can adopt frequency range division methods as shown in Figure 1, this frequency range is divided into partly overlapping each frequency sub-band, each frequency sub-band utilizing any one frequency range division methods as shown in Figure 1 to mark off can form network as shown in Figure 2.
The subject matter of FSFR networking plan is, after networking, in each neighbor cell edge and non-fully with frequently, therefore the communication performance comparing each Cell Edge User of identical networking scheme improves, but owing to still there is frequency overlap in each neighbor cell edge, make the problem that still there is adjacent cell frequencies collision in each neighbor cell edge, the communication performance of each Cell Edge User still can not be ensured preferably.
Summary of the invention
The embodiment of the present invention provides a kind of network coverage method, the method for base station and access network, base station, the problem that the communication performance for solving each Cell Edge User in prior art is poor.
A kind of network coverage method, the method comprises:
Determine all non-overlapping at least three one-level frequency ranges mutually, in any two neighbor cells in region to be covered, use different one-level frequency ranges to cover, form the ground floor network covered continuously in described region to be covered;
Determine a secondary frequency range all non-overlapping with described at least three one-level frequency ranges, in the first subregion of at least one community in described region to be covered, use this secondary frequency range to cover, the the first subregion zero lap using this secondary frequency range to carry out covering in any two neighbor cells in described region to be covered, forms the second layer network of discontinuous covering in described region to be covered.
A kind of base station, this base station comprises:
First overlay module, for determining all non-overlapping at least three one-level frequency ranges mutually, using different one-level frequency ranges to cover, forming the ground floor network covered continuously in described region to be covered in any two neighbor cells in region to be covered;
Second overlay module, for determining a secondary frequency range all non-overlapping with described at least three one-level frequency ranges, in the first subregion of at least one community in described region to be covered, use this secondary frequency range to cover, the the first subregion zero lap using this secondary frequency range to carry out covering in any two neighbor cells in described region to be covered, forms the second layer network of discontinuous covering in described region to be covered.
A method for access network, the method comprises:
The access request that receiving terminal is initiated;
When this terminal is only positioned at the region of the ground floor network coverage, by this terminal access ground floor network, when this terminal is positioned at the region that ground floor network and the non-ground floor network of any one deck cover jointly, this terminal is accessed the non-ground floor network in common overlay area, when this terminal is positioned at the region that at least three-layer network covers jointly, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
A kind of base station, this base station comprises:
Receiver module, for the access request that receiving terminal is initiated;
Access module, for when this terminal is only positioned at the region of the ground floor network coverage, by this terminal access ground floor network, when this terminal is positioned at the region that ground floor network and the non-ground floor network of any one deck cover jointly, this terminal is accessed the non-ground floor network in common overlay area, when this terminal is positioned at the region that at least three-layer network covers jointly, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
According to the scheme that the embodiment of the present invention provides, when carrying out the network coverage, build on the basis of the ground floor network covered continuously utilizing the mode of inter-frequency networking, the frequency range all not identical with each frequency range of ground floor network is utilized to build the second layer common-frequency network of discontinuous covering, thus while the communication performance promoting Cell Edge User, the throughput of the whole network can also be taken into account.The embodiment of the present invention additionally provides the scheme of the network that a kind of access utilizes above network coverage scheme to form.
Accompanying drawing explanation
Fig. 1 is the frequency range division methods schematic diagram in prior art in FSFR networking plan;
Fig. 2 is the network diagram utilizing FSFR networking plan to form in prior art;
The flow chart of steps of a kind of network coverage method that Fig. 3 provides for the embodiment of the present invention one;
The communication system frequency range dividing mode schematic diagram that Fig. 4 (a) provides for the embodiment of the present invention one;
The communication system frequency range dividing mode schematic diagram that Fig. 4 (b) provides for the embodiment of the present invention one;
The structural representation of the base station that Fig. 5 provides for the embodiment of the present invention two;
The base station network that Fig. 6 provides for the embodiment of the present invention two covers schematic diagram;
The base station operation mode schematic diagram that Fig. 7 (a) provides for the embodiment of the present invention two;
The base station operation mode schematic diagram that Fig. 7 (b) provides for the embodiment of the present invention two;
The flow chart of steps of the method for a kind of access network that Fig. 8 provides for the embodiment of the present invention three;
The structural representation of the base station that Fig. 9 provides for the embodiment of the present invention four.
Embodiment
In order to solve TD-LTE system problem of co-channel interference in networking process, promote Cell Edge User communication performance, ensure the communication performance of whole network, the embodiment of the present invention provides a kind of Hierarchical Network network strategy based on concentric circles framework, utilize the mode of the common-frequency network of the discontinuous covering of all standing network building-out of inter-frequency networking, while the communication performance promoting Cell Edge User, take into account the throughput of the whole network, simultaneously, utilize the scheme that the embodiment of the present invention provides, can also ensure that the realization of engineering networking is simple.
Below in conjunction with each embodiment and accompanying drawing, technical solution of the present invention is described.
Embodiment one,
The embodiment of the present invention one provides a kind of network coverage method, is illustrated in figure 3 the flow chart of steps of the method, comprises:
Step 101, determine mutually all non-overlapping at least three one-level frequency ranges.
Step 102, formation ground floor network.
This step specifically comprises: in any two neighbor cells in region to be covered, use different one-level frequency ranges to cover, and forms the ground floor network covered continuously in described region to be covered.
Step 103, determine a secondary frequency range all non-overlapping with described at least three one-level frequency ranges.
Step 104, formation second layer network.
This step specifically comprises: in the first subregion of at least one community in described region to be covered, use this secondary frequency range to cover, the the first subregion zero lap using this secondary frequency range to carry out covering in any two neighbor cells in described region to be covered, forms the second layer network of discontinuous covering in described region to be covered.
On the basis forming second layer network, in order to improve the throughput in region to be covered further, can the further overlays third layer in region to be covered, the 4th layer ... n-th layer network:
Step 105, repeat this step, and often perform a deuterzooid step, m value adds 1, until m value reaches set point M, terminate the execution of this step, the initial value of m is set as 3.
Determine an all non-overlapping m level frequency range with the frequency range determined, in the m-1 subregion of at least one community in described region to be covered, use this m level frequency range to cover, any two neighbor cells in described region to be covered use this m level frequency range to carry out the m-1 subregion zero lap covered, and form the m layer network of discontinuous covering in described region to be covered.
For each community, the region of any one deck network coverage in 2nd ~ N layer network can be completely overlapping, and also can be partly overlapping, also can be completely nonoverlapping.
In the present embodiment, except ground floor network covers region to be covered completely, in region to be covered, 2nd ~ N layer network is the network of discontinuous covering, the area of the subregion of the n-th layer network coverage in community, i-th, described region to be covered can be determined by the following method, described n be greater than 1 positive integer:
S i n = S i 1 × ( T i α I i β ) γ
Wherein:
it is the area of the overlay area of the n-th layer network of i-th community;
it is the area of the overlay area of the 1st layer network of i-th community;
T iit is the total throughout of i-th community;
I iit is the co-channel interference that i-th community is subject to;
α, beta, gamma is coefficient factor, for adjusting the impact of correlative factor for overlay area.
In order to avoid neighbor cell same layer network (any layer network in 2nd ~ N layer network) between co-channel interference, zero lap between the region using this same layer network coverage in any two neighbor cells.Preferably, for each community, the center being centrally located at this community in the region of any one deck network coverage in 2nd ~ N layer network can be set, thus reduce the possibility producing co-channel interference between neighbor cell further.
In the present embodiment, can be determine from the communication system frequency range divided in advance for carrying out the frequency range of each layer network covering.For region to be covered can communication system frequency range for 2570 ~ 2620MHz, this communication system frequency range can be divided into four frequency ranges to be used for follow-uply therefrom determining one-level frequency range (3) and secondary frequency range (1), four frequency ranges marked off can respectively with frequency f1, f2, f3, f4 identifies, concrete, can carry out frequency range division by following two kinds of modes:
First kind of way,
As shown in Fig. 4 (a); at the protection interval of each reserved 5MHz in communication system frequency range 2570 ~ 2620MHz two ends to be divided; 2575 ~ 2615MHz is evenly divided into 4 frequency ranges (also can unevenly dividing), after division, the frequency range of each frequency mark is 10MHz.Follow-up can by frequency f1, the frequency range of f2, f3 mark is as one-level frequency range, and the frequency range identified by frequency f4 is as secondary frequency range.
The second way,
As shown in Fig. 4 (b), communication system frequency range 2570 ~ 2620MHz to be divided is divided into 4 frequency ranges (also can evenly divide), after division, frequency f1, the frequency range of f2, f3 mark is 10MHz, and the frequency range that frequency f4 identifies is 20MHz.Follow-up can by frequency f1, the frequency range of f2, f3 mark is as one-level frequency range, and the frequency range identified by frequency f4 is as secondary frequency range.
In above two kinds of communication system frequency range dividing mode, the first dividing mode has reserved the protection bandwidth with other system, the relative second way, comparatively strong to the antijamming capability of near frequency system, but total throughout is lower; The communication system frequency range that the second way divides is 50MHz, and relative to first kind of way, total throughout is high, but poor to the antijamming capability of near frequency system.
The scheme that the embodiment of the present invention one provides is solving the problem of co-channel interference of Cell Edge User, while improving the communication performance of Cell Edge User, because each cell edge only has the alien frequencies network coverage, therefore user is when access network, can automatically reside in the network of alien frequencies, eliminate the link that base station side judges, the time of user access network can be saved.The scheme that the embodiment of the present invention one provides can also ensure the total throughout of community, has simultaneously and realizes simple advantage.
Embodiment two,
With the embodiment of the present invention one based on same inventive concept, the embodiment of the present invention two provides a kind of base station, is illustrated in figure 5 the structural representation of this base station, comprises the first overlay module 11 and the second overlay module 12, wherein:
First overlay module 11, for determining all non-overlapping at least three one-level frequency ranges mutually, uses different one-level frequency ranges to cover in any two neighbor cells in region to be covered, forms the ground floor network covered continuously in described region to be covered; Second overlay module 12 is for determining a secondary frequency range all non-overlapping with described at least three one-level frequency ranges, in the first subregion of at least one community in described region to be covered, use this secondary frequency range to cover, the the first subregion zero lap using this secondary frequency range to carry out covering in any two neighbor cells in described region to be covered, forms the second layer network of discontinuous covering in described region to be covered.
This base station also comprises m overlay module, m=3,4......M, identifies respectively with 13,14......1M:
M overlay module, for determining an all non-overlapping m level frequency range with the frequency range determined, in the m-1 subregion of at least one community in described region to be covered, use this m level frequency range to cover, any two neighbor cells in described region to be covered use this m level frequency range to carry out the m-1 subregion zero lap covered, and form the m layer network of discontinuous covering in described region to be covered.
The n-th overlay module in base station, specifically for determining the area of the subregion of the n-th layer network coverage in community, i-th, described region to be covered by the following method, described n be greater than 1 positive integer:
S i n = S i 1 × ( T i α I i β ) γ
Wherein:
it is the area of the overlay area of the n-th layer network of i-th community;
it is the area of the overlay area of the 1st layer network of i-th community;
T iit is the total throughout of i-th community;
I iit is the co-channel interference that i-th community is subject to;
α, beta, gamma is coefficient factor, for adjusting the impact of correlative factor for overlay area.
In the present embodiment, base station can adopt directional antenna to carry out the network coverage, to form two-tier network, as shown in Figure 6, each base station may be used for the network coverage realizing three communities, supposes that three communities corresponding to each base station utilize frequency f1, f2 respectively, the different frequency range that f3 is corresponding carries out the ground floor network coverage, utilizes the frequency range that frequency f4 is corresponding to carry out the second layer network coverage.The intensity of f1, f2, f3 tri-frequency signals can be determined in each base station according to network actual conditions, the ground floor network coverage is formed in each community utilizing this base station to carry out in three communities of the network coverage, and the signal of f4 frequency can be launched according to existing frequency range situation, ensure that this signal strength signal intensity will lower than the intensity of each community ground floor network frequency used in three communities, the signal of f4 frequency only needs the core of coverage cell, to reduce the possibility producing co-channel interference between neighbor cell.Concrete, by adjustment relevant parameter, as adjusted frequency transmitting power and/or adopting the modes such as different antenna lower decline angles, can ensure that base station forms the signal strength signal intensity needed for ground floor network and second layer network in each community.
A base station is for its community of carrying out covering of needs, and needs can support two or more carrier wave, if base station ability only supports single carrier, then can adopt the mode of two base station parallel connections, guarantee that two carrier waves at least can be supported in base station.The working method of base station can as shown in Fig. 7 (a) He Fig. 7 (b).
Embodiment three,
For the hierarchical network of the network coverage method formation that the embodiment of the present invention one provides, the embodiment of the present invention three provides a kind of method accessing hierarchical network, is illustrated in figure 8 the flow chart of steps of the method, comprises:
Step 201, access a certain layer network.
This step specifically comprises: the access request that receiving terminal is initiated, when the terminal of this initiation access request is only positioned at the region of the ground floor network coverage, by this terminal access ground floor network, when this terminal is positioned at the region that ground floor network and the non-ground floor network of any one deck cover jointly, this terminal is accessed the non-ground floor network in common overlay area, when this terminal is positioned at the region that at least three-layer network covers jointly, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
Concrete, Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio that can be current according to each layer network in the common overlay area of three-layer network, SINR) or according to the SINR of current each layer network and Reference Signal Received Power (Reference Signal Receiving Power, RSRP), by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
Step 202, carry out switching between network layer.
According to the network load of this layer network and/or the position of terminal of present terminal access, terminal switch is linked into the network of other layers.
In the scheme of the access network provided at the present embodiment, according to the situation at network load and terminal place, access and resident network can be selected.
Embodiment four,
The embodiment of the present invention four provides a kind of base station, is illustrated in figure 9 the structural representation of this base station, comprises receiver module 21 and access module 22, wherein:
The access request that receiver module 21 is initiated for receiving terminal; Access module 22 is for when this terminal is only positioned at the region of the ground floor network coverage, by this terminal access ground floor network, when this terminal is positioned at the region that ground floor network and the non-ground floor network of any one deck cover jointly, this terminal is accessed the non-ground floor network in common overlay area, when this terminal is positioned at the region that at least three-layer network covers jointly, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
Access module 22 specifically for according to the current Signal to Interference plus Noise Ratio SINR of each layer network in the common overlay area of three-layer network or according to the SINR of current each layer network and Reference Signal Received Power RSRP, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
This base station also comprises handover module 23:
Terminal switch, for the network load of this layer network that accesses according to present terminal and/or the position of terminal, is linked into the network of other layers by handover module 23.
The base station provided in the base station provided in the present embodiment and embodiment two can be same base station.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.

Claims (12)

1. a network coverage method, is characterized in that, the method comprises:
Determine all non-overlapping at least three one-level frequency ranges mutually, in any two neighbor cells in region to be covered, use different one-level frequency ranges to cover, form the ground floor network covered continuously in described region to be covered;
Determine a secondary frequency range all non-overlapping with described at least three one-level frequency ranges, in the first subregion of at least one community in described region to be covered, use this secondary frequency range to cover, the the first subregion zero lap using this secondary frequency range to carry out covering in any two neighbor cells in described region to be covered, forms the second layer network of discontinuous covering in described region to be covered.
2. the method for claim 1, is characterized in that, after described region to be covered forms the second layer network of discontinuous covering, the method also comprises:
Perform the following step, and often perform a following step, m value adds 1, until m value reaches set point M, terminate the execution of the following step, the initial value of m is set as 3:
Determine an all non-overlapping m level frequency range with the frequency range determined, in the m-1 subregion of at least one community in described region to be covered, use this m level frequency range to cover, any two neighbor cells in described region to be covered use this m level frequency range to carry out the m-1 subregion zero lap covered, and form the m layer network of discontinuous covering in described region to be covered.
3. method as claimed in claim 2, is characterized in that, determine the area of the subregion of the n-th layer network coverage in community, i-th, described region to be covered by the following method, described n be greater than 1 positive integer:
S i n = S i l × ( T i α I i β ) γ
Wherein:
it is the area of the overlay area of the n-th layer network of i-th community;
it is the area of the overlay area of the 1st layer network of i-th community;
T iit is the total throughout of i-th community;
I iit is the co-channel interference that i-th community is subject to;
α, beta, gamma is coefficient factor, for adjusting the impact of correlative factor for overlay area.
4. a base station, is characterized in that, this base station comprises:
First overlay module, for determining all non-overlapping at least three one-level frequency ranges mutually, using different one-level frequency ranges to cover, forming the ground floor network covered continuously in described region to be covered in any two neighbor cells in region to be covered;
Second overlay module, for determining a secondary frequency range all non-overlapping with described at least three one-level frequency ranges, in the first subregion of at least one community in described region to be covered, use this secondary frequency range to cover, the the first subregion zero lap using this secondary frequency range to carry out covering in any two neighbor cells in described region to be covered, forms the second layer network of discontinuous covering in described region to be covered.
5. base station as claimed in claim 4, it is characterized in that, this base station also comprises m overlay module, m=3, and 4 ... M:
M overlay module, for determining an all non-overlapping m level frequency range with the frequency range determined, in the m-1 subregion of at least one community in described region to be covered, use this m level frequency range to cover, any two neighbor cells in described region to be covered use this m level frequency range to carry out the m-1 subregion zero lap covered, and form the m layer network of discontinuous covering in described region to be covered.
6. base station as claimed in claim 5, is characterized in that,
N-th overlay module, specifically for determining the area of the subregion of the n-th layer network coverage in community, i-th, described region to be covered by the following method, described n be greater than 1 positive integer:
S i n = S i l × ( T i α I i β ) γ
Wherein:
it is the area of the overlay area of the n-th layer network of i-th community;
it is the area of the overlay area of the 1st layer network of i-th community;
T iit is the total throughout of i-th community;
I iit is the co-channel interference that i-th community is subject to;
α, beta, gamma is coefficient factor, for adjusting the impact of correlative factor for overlay area.
7. access utilizes the arbitrary described method of claim 1 ~ 3 to carry out a method for the network covered, and it is characterized in that, the method comprises:
The access request that receiving terminal is initiated;
When this terminal is only positioned at the region of the ground floor network coverage, by this terminal access ground floor network, when this terminal is positioned at the region that ground floor network and the non-ground floor network of any one deck cover jointly, this terminal is accessed the non-ground floor network in common overlay area, when this terminal is positioned at the region that at least three-layer network covers jointly, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
8. method as claimed in claim 7, it is characterized in that, after accessing terminal to network, the method also comprises:
According to the network load of this layer network and/or the position of terminal of present terminal access, terminal switch is linked into the network of other layers.
9. method as claimed in claim 7, is characterized in that, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network, specifically comprise:
The Signal to Interference plus Noise Ratio SINR current according to each layer network in the common overlay area of three-layer network or according to the SINR of current each layer network and Reference Signal Received Power RSRP, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
10. a base station, is characterized in that, this base station comprises:
Receiver module, for the access request that receiving terminal is initiated;
Access module, for when this terminal is only positioned at the region of the ground floor network coverage, by this terminal access ground floor network, when this terminal is positioned at the region that ground floor network and the non-ground floor network of any one deck cover jointly, this terminal is accessed the non-ground floor network in common overlay area, when this terminal is positioned at the region that at least three-layer network covers jointly, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
11. base stations as claimed in claim 10, it is characterized in that, this base station also comprises:
Handover module, for the network load of this layer network that accesses according to present terminal and/or the position of terminal, is linked into the network of other layers by terminal switch.
12. base stations as claimed in claim 10, is characterized in that,
Described access module, specifically for according to the current Signal to Interference plus Noise Ratio SINR of each layer network in the common overlay area of three-layer network or according to the SINR of current each layer network and Reference Signal Received Power RSRP, by the layer network except ground floor network in this common overlay area of terminal Stochastic accessing three-layer network.
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