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

Abstract

Embodiments of the present invention provide a network coverage method, a base station, a method for accessing a network, and a base station, including: when performing network coverage, on the basis of constructing a first-layer network with continuous coverage in a different-frequency networking manner, using Different frequency bands from the first-tier network build a second-tier same-frequency network with discontinuous coverage, so that while improving the communication performance of cell edge users, it can also take into account the throughput of the entire network. The embodiment of the present invention also provides a scheme for accessing a network composed of the above network coverage scheme.

Description

Network coverage method, base station and method for accessing network, base station

technical field

The invention relates to the field of mobile communication, in particular to a network coverage method, a base station, a method for accessing a network, and a base station.

Background technique

According to the third generation partnership project (third generation partnership project, 3GPP) agreement, for the third generation mobile communication technology (3rd-generation, 3G) and subsequent technical standards, such as the long-term evolution of TD-SCDMA (TD-SCDMA Long Term Evolution, TD-LTE) technology, the frequency reuse factor of the network can be 1, that is, the network can realize the same frequency networking of the whole network, and use the same frequency networking technology to obtain higher spectrum utilization. However, according to the existing simulation results, after co-frequency networking, due to the influence of co-frequency interference between adjacent cells, the communication performance of users is seriously degraded at the edge of each cell, which affects the communication performance of the entire network.

Aiming at the same-frequency interference problem existing in the same-frequency networking, the prior art provides a frequency shifted frequency reuse (Frequency Shifted Frequency Reuse, FSFR) networking solution. In the FSFR networking scheme, the frequency band division method shown in Figure 1 can be used to divide the frequency band into partially overlapping sub-frequency bands, and each sub-frequency band divided by any frequency band division method shown in Figure 1 A network as shown in Figure 2 can be formed.

The main problem with the FSFR networking scheme is that after networking, the adjacent cell edges are not completely on the same frequency. Therefore, compared with the same-frequency networking scheme, the communication performance of users at the edge of each cell has been improved. There is still frequency overlap at the edge of adjacent cells, so that there is still a problem of frequency collision between adjacent cells at the edge of each adjacent cell, and the communication performance of users at the edge of each cell cannot be well guaranteed.

Contents of the invention

Embodiments of the present invention provide a network coverage method, a base station, a method for accessing a network, and a base station, which are used to solve the problem of poor communication performance of users at the edge of each cell in the prior art.

A network coverage method, the method comprising:

Determine at least three first-level frequency bands that do not overlap with each other, use different first-level frequency bands for coverage in any two adjacent cells in the area to be covered, and form a first-tier network with continuous coverage in the area to be covered;

Determining a secondary frequency band that does not overlap with the at least three primary frequency bands, using the secondary frequency band in the first sub-area of at least one cell in the area to be covered, any of the areas to be covered The first sub-areas covered by the secondary frequency band in two adjacent cells do not overlap, and a second-layer network with discontinuous coverage is formed in the area to be covered.

A base station, the base station includes:

The first coverage module is configured to determine at least three primary frequency bands that do not overlap with each other, use different primary frequency bands for coverage in any two adjacent cells in the area to be covered, and form continuous coverage in the area to be covered the first layer network;

The second coverage module is configured to determine a secondary frequency band that does not overlap with the at least three primary frequency bands, and use the secondary frequency band to cover in the first sub-area of at least one cell in the area to be covered, The first sub-areas covered by the secondary frequency band in any two adjacent cells of the area to be covered have no overlap, forming a second-layer network with discontinuous coverage in the area to be covered.

A method of accessing a network, the method comprising:

receiving an access request initiated by a terminal;

When the terminal is only located in the area covered by the first-tier network, connect the terminal to the first-tier network; To access a non-first-tier network in the common coverage area, when the terminal is located in an area covered by at least three-tier networks, randomly access the terminal to a network other than the first-tier network in the common coverage area of the three-tier network layer network.

A base station, the base station includes:

a receiving module, configured to receive an access request initiated by a terminal;

The access module is used to connect the terminal to the first-tier network when the terminal is only located in the area covered by the first-tier network; When the terminal is in a common coverage area, the terminal is connected to a non-first-tier network in the common coverage area. When the terminal is located in an area covered by at least three layers of networks, the terminal is randomly connected to a network other than the first A layer network beyond the layer network.

According to the solution provided by the embodiment of the present invention, when performing network coverage, on the basis of constructing the first-layer network with continuous coverage by means of different-frequency networking, use frequency bands different from the frequency bands of the first-layer network to construct The second-tier co-frequency network with discontinuous coverage can improve the communication performance of cell edge users while taking into account the throughput of the entire network. The embodiment of the present invention also provides a scheme for accessing a network composed of the above network coverage scheme.

Description of drawings

FIG. 1 is a schematic diagram of a frequency band division method in an FSFR networking scheme in the prior art;

FIG. 2 is a schematic diagram of a network composed of FSFR networking schemes in the prior art;

FIG. 3 is a flow chart of steps of a network coverage method provided in Embodiment 1 of the present invention;

FIG. 4(a) is a schematic diagram of a communication system frequency band division method provided by Embodiment 1 of the present invention;

FIG. 4(b) is a schematic diagram of a communication system frequency band division method provided by Embodiment 1 of the present invention;

FIG. 5 is a schematic structural diagram of a base station provided in Embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of base station network coverage provided by Embodiment 2 of the present invention;

FIG. 7(a) is a schematic diagram of the working mode of the base station provided by Embodiment 2 of the present invention;

FIG. 7(b) is a schematic diagram of the working mode of the base station provided by Embodiment 2 of the present invention;

FIG. 8 is a flowchart of steps of a method for accessing a network provided by Embodiment 3 of the present invention;

FIG. 9 is a schematic structural diagram of a base station provided by Embodiment 4 of the present invention.

Detailed ways

In order to solve the same-frequency interference problem in the TD-LTE system networking process, improve the communication performance of cell edge users, and ensure the communication performance of the entire network, the embodiment of the present invention provides a layered network strategy based on a concentric circle architecture. The full-coverage network of the frequency group network is added with the same-frequency network with discontinuous coverage. While improving the communication performance of the cell edge users, the throughput of the entire network is taken into account. At the same time, the solution provided by the embodiment of the present invention can also ensure The realization of engineering networking is simple.

The technical solution of the present invention will be described below in conjunction with various embodiments and accompanying drawings.

Embodiment one,

Embodiment 1 of the present invention provides a network coverage method, as shown in FIG. 3 is a flow chart of the steps of the method, including:

Step 101. Determine at least three primary frequency bands that do not overlap with each other.

Step 102, forming a first-layer network.

This step specifically includes: using different first-level frequency bands for coverage in any two adjacent cells in the area to be covered, and forming a first-layer network with continuous coverage in the area to be covered.

Step 103. Determine a secondary frequency band that does not overlap with the at least three primary frequency bands.

Step 104, forming a second layer network.

This step specifically includes: using the secondary frequency band for coverage in the first sub-area of at least one cell in the area to be covered, and using the secondary frequency band for coverage in any two adjacent cells in the area to be covered The first sub-area has no overlap, and a second-layer network with discontinuous coverage is formed in the area to be covered.

On the basis of forming the second-layer network, in order to further improve the throughput of the area to be covered, the third-layer, fourth-layer...N-layer network can be further covered in the area to be covered:

Step 105. Repeat this step, and every time this step is executed, the value of m is increased by 1 until the value of m reaches the set value M, and the execution of this step is ended, and the initial value of m is set to 3.

Determine an m-level frequency band that does not overlap with the determined frequency bands, and use the m-level frequency band to cover in the m-1th sub-area of at least one cell in the area to be covered, and any two of the areas to be covered The m-1th sub-areas covered by the m-level frequency bands of adjacent cells do not overlap, forming an m-th layer network with discontinuous coverage in the area to be covered.

For each cell, the areas covered by any layer of the 2nd to N-layer networks may be completely overlapped, partially overlapped, or not overlapped at all.

In this embodiment, except that the first layer network completely covers the to-be-covered area, in the to-be-covered area, the 2nd to N-layer networks are discontinuously covered networks, and the i-th network of the to-be-covered area can be determined by the following method The area of the sub-area covered by the n-th layer network in the cell, where n is a positive integer greater than 1:

${\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&times;</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}}{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; \&beta;</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}$

in:

is the coverage area of the n-th layer network of the i-th cell;

is the coverage area of the layer 1 network of the i-th cell;

T _i is the total throughput of the i-th cell;

I _i is the same-frequency interference received by the i-th cell;

α, β, and γ are all coefficient factors, which are used to adjust the influence of related factors on the coverage area.

In order to avoid co-channel interference between the same layer network (any layer network in the 2nd to N layer networks) of adjacent cells, there is no overlap between the areas covered by the same layer network in any two adjacent cells. Preferably, for each cell, the center of the area covered by any layer of the 2nd to N-layer networks can be set to be located at the center of the cell, so as to further reduce the possibility of co-channel interference between adjacent cells.

In this embodiment, the frequency bands used for network coverage of each layer may be determined from pre-divided communication system frequency bands. Taking the frequency band of the communication system available in the area to be covered as 2570-2620MHz as an example, the frequency band of the communication system can be divided into four frequency bands for subsequent determination of the first-level frequency band (3) and the second-level frequency band (1). The four frequency bands can be identified by frequency points f1, f2, f3, and f4 respectively. Specifically, the frequency bands can be divided in the following two ways:

the first way,

As shown in Figure 4(a), a guard interval of 5 MHz is reserved at both ends of the communication system frequency band 2570-2620 MHz to be divided, and 2575-2615 MHz is evenly divided into 4 frequency bands (it can also be divided unevenly). After division, The frequency band marked by each frequency point is 10MHz. Subsequently, the frequency bands identified by the frequency points f1, f2, and f3 can be used as the first-level frequency band, and the frequency band identified by the frequency point f4 can be used as the second-level frequency band.

the second way,

As shown in Figure 4(b), the communication system frequency band 2570-2620MHz to be divided is divided into 4 frequency bands (it can also be divided evenly). After division, the frequency bands marked by frequency points f1, f2, and f3 are all 10MHz, The frequency band marked by f4 is 20MHz. Subsequently, the frequency bands identified by the frequency points f1, f2, and f3 can be used as the first-level frequency band, and the frequency band identified by the frequency point f4 can be used as the second-level frequency band.

Among the above two communication system frequency band division methods, the first division method reserves the protection bandwidth with other systems. Compared with the second method, it has stronger anti-interference ability to adjacent frequency systems, but the total throughput is lower; The frequency band of the communication system divided by the second method is 50MHz. Compared with the first method, the total throughput is high, but the anti-interference ability to adjacent frequency systems is poor.

The solution provided by Embodiment 1 of the present invention solves the same-frequency interference problem of cell-edge users and improves the communication performance of cell-edge users. Since each cell edge is only covered by a different-frequency network, when users access the network, It can automatically reside in a different-frequency network, which saves the judgment link on the base station side and saves the time for users to access the network. The solution provided by Embodiment 1 of the present invention can also guarantee the total throughput of the cell, and has the advantage of simple implementation.

Embodiment two,

Based on the same inventive concept as Embodiment 1 of the present invention, Embodiment 2 of the present invention provides a base station, as shown in FIG. 5 , which is a schematic structural diagram of the base station, including a first covering module 11 and a second covering module 12, wherein:

The first coverage module 11 is used to determine at least three primary frequency bands that do not overlap with each other, use different primary frequency bands to cover any two adjacent cells in the area to be covered, and form continuous coverage in the area to be covered The first-tier network; the second coverage module 12 is used to determine a secondary frequency band that does not overlap with the at least three primary frequency bands, and use this in the first sub-area of at least one cell in the area to be covered The second-level frequency band is used for coverage, and the first sub-areas covered by the second-level frequency band in any two adjacent cells in the area to be covered have no overlap, and a second-layer network with discontinuous coverage is formed in the area to be covered.

The base station also includes an mth coverage module, m=3, 4...M, identified by 13, 14...1M respectively:

The m-th coverage module is configured to determine an m-level frequency band that does not overlap with the determined frequency bands, and use the m-level frequency band to cover in the m-1th sub-area of at least one cell in the area to be covered, so Any two adjacent cells in the area to be covered use the m-level frequency band to cover the m-1th sub-area without overlapping, forming an m-th layer network with discontinuous coverage in the area to be covered.

The n-th coverage module in the base station is specifically used to determine the area of the sub-area covered by the n-th layer network in the i-th cell in the area to be covered by the following method, and the n is a positive integer greater than 1:

${\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; no</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; S</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; \&times;</span>{<span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; \&alpha;</span>}}}{{\mathrm{<span\; class="notranslate">\; I</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}^{\mathrm{<span\; class="notranslate">\; \&beta;</span>}}}<span\; class="notranslate">\; )</span>}^{\mathrm{<span\; class="notranslate">\; \&gamma;</span>}}$

in:

is the coverage area of the n-th layer network of the i-th cell;

is the coverage area of the layer 1 network of the i-th cell;

T _i is the total throughput of the i-th cell;

I _i is the same-frequency interference received by the i-th cell;

α, β, and γ are all coefficient factors, which are used to adjust the influence of related factors on the coverage area.

In this embodiment, the base station can use directional antennas for network coverage, taking the formation of a two-layer network as an example, as shown in Figure 6, each base station can be used to achieve network coverage of three cells, assuming that each base station corresponds to three The cells respectively use different frequency bands corresponding to frequency points f1, f2, and f3 for the first-layer network coverage, and use the frequency band corresponding to frequency point f4 for second-layer network coverage. Each base station can determine the signal strengths of the three frequency points f1, f2, and f3 according to the actual situation of the network, and form the first layer of network coverage in each of the three cells that use the base station for network coverage. In the case of frequency bands, transmit the signal at frequency f4 to ensure that the signal strength is lower than the strength of the frequency used by the first-layer network of each of the three cells. The signal at frequency f4 only needs to cover the center of the cell to reduce The possibility of co-channel interference between adjacent cells. Specifically, it is possible to ensure the signal strength required by the base station to form the first-layer network and the second-layer network in each cell by adjusting the corresponding parameters, such as adjusting the frequency point transmission power and/or adopting different antenna electrical downtilt angles, etc. .

A base station needs to be able to support more than two carriers for a cell that needs to be covered. If the base station can only support a single carrier, two base stations can be connected in parallel to ensure that the base station can support at least two carriers. The working mode of the base station can be shown in Fig. 7(a) and Fig. 7(b).

Embodiment three,

For the layered network formed by the network coverage method provided in Embodiment 1 of the present invention, Embodiment 3 of the present invention provides a method for accessing a layered network. FIG. 8 is a flowchart of the steps of the method, including:

Step 201, access a certain layer of network.

This step specifically includes: receiving an access request initiated by a terminal, and when the terminal that initiated the access request is located only in the area covered by the first-tier network, accessing the terminal to the first-tier network, and when the terminal is located in the first-tier network When the terminal is in an area covered by any layer other than the first layer network, the terminal is connected to the non-first layer network in the common coverage area. When the terminal is located in an area covered by at least three layers of networks, the terminal is randomly connected to the Access to a layer-1 network other than the layer-1 network in the common coverage area of the layer-3 network.

Specifically, it can be based on the current signal to interference plus noise ratio (Signal to Interference plus Noise Ratio, SINR) of each layer network in the common coverage area of the three-layer network or according to the current SINR and reference signal received power (Reference Signal Received Power) of each layer network Receiving Power, RSRP), the terminal is randomly connected to the layer-1 network except the layer-1 network in the common coverage area of the three-layer network.

Step 202, perform inter-network handover.

According to the network load and/or the location of the terminal that the current terminal accesses the network of this layer, the terminal is switched to access the network of other layers.

In the network access solution provided in this embodiment, the network to access and reside on can be selected according to the network load and the location of the terminal.

Embodiment four,

Embodiment 4 of the present invention provides a base station. FIG. 9 is a schematic structural diagram of the base station, including a receiving module 21 and an access module 22, wherein:

The receiving module 21 is used to receive the access request initiated by the terminal; the access module 22 is used to connect the terminal to the first-layer network when the terminal is only located in the area covered by the first-layer network. network and any layer of non-first-tier network, connect the terminal to the non-first-tier network in the common coverage area, and when the terminal is in an area covered by at least three layers of network, randomly Access to a layer-1 network other than the layer-1 network in the common coverage area of the layer-3 network.

The access module 22 is specifically configured to randomly access the terminal to the three layers according to the current signal-to-interference-plus-noise ratio (SINR) of each layer network in the common coverage area of the three-layer network or according to the current SINR and reference signal received power RSRP of each layer network. Layer networks collectively cover a layer of networks other than the first layer network in the area.

The base station also includes a switching module 23:

The switching module 23 is used for switching the terminal to access the network of another layer according to the network load of the layer network currently accessed by the terminal and/or the location of the terminal.

The base station provided in this embodiment and the base station provided in Embodiment 2 may be the same base station.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

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:

$S_i^n=S_i^l\&times;{\left(\frac{T_i^{\mathrm{\&alpha;}}}{I_i^{\mathrm{\&beta;}}}\right)}^{\mathrm{\&gamma;}}$

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:

$S_i^n=S_i^l\&times;{\left(\frac{T_i^{\mathrm{\&alpha;}}}{I_i^{\mathrm{\&beta;}}}\right)}^{\mathrm{\&gamma;}}$

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.