CN101998412B - Frequency resource allocation method, home node B management system (HMS) and Femto eNB - Google Patents

Abstract

The present invention proposes a method for allocating frequency resources for a Femto base station (Femto eNB), a home base station management system (HMS) and a Femto eNB, wherein the method includes: powering on the Femto eNB to be allocated, searching for the corresponding Femto eNB to be allocated Neighboring Femto eNBs, obtaining the reference signal received power (RSRP) and frequency resource usage of the neighboring Femto eNBs, and when the RSRP of the neighboring Femto eNBs is greater than a preset threshold, allocate the Femto eNBs to be allocated A frequency resource orthogonal to the frequency used by the adjacent Femto eNB. The invention can reduce the interference between adjacent Femto eNBs.

Description

Method for allocating frequency resources, home base station management system and femto base station

technical field

The present invention relates to the field of femtocell (Femtocell) technology, in particular to a method for allocating frequency resources for Femto eNB, a home base station management system (HMS) and Femto eNB.

Background technique

Femtocell (Femtocell) is also called femtocell. Femto eNB is a small, low-power cellular base station, which is mainly used in indoor places such as homes and offices, so it is also called home base station. Its role is to provide users with voice and data services as a supplement to the indoor coverage of the cellular network. The interference problem between Femto eNBs is one of the key issues that must be solved when actually allocating frequency resources for Femto eNBs.

At present, Femtocell has been applicable to various standards such as GSM, UMTS and products supporting 2G, 2.5G, 3G, and Femtocell applicable to LTE is also in the process of standardization. At present, there is no method for allocating frequency resources for Femto eNBs that can well solve the interference problem between adjacent Femto eNBs.

Contents of the invention

The present invention proposes a method for allocating frequency resources for Femto eNBs, which can reduce interference between adjacent Femto eNBs.

The present invention also proposes another method for allocating frequency resources for Femto eNBs, which can reduce interference between adjacent Femto eNBs.

The present invention also proposes an HMS and a Femto eNB, which can reduce interference between adjacent Femto eNBs.

Technical scheme of the present invention is realized like this:

A method for allocating frequency resources for a Femto eNB, comprising:

Power on the Femto eNB to be allocated, search for the adjacent Femto eNB of the Femto eNB to be allocated, and obtain the RSRP and frequency resource usage of the adjacent Femto eNB, when the RSRP of the adjacent Femto eNB is greater than the preset threshold , allocate frequency resources orthogonal to the frequencies used by the neighboring Femto eNBs for the Femto eNB to be allocated.

A method for allocating frequency resources for a Femto eNB, comprising:

When the Femto eNB to be allocated judges that the same carrier/subband is multiplexed with the adjacent Femto eNB, whether the SINR calculated by the UE of the Femto eNB to be allocated is greater than the preset first threshold, and if it is greater than, the adjacent Femto eNB The eNB sends a multiplexing request including the carrier/subband identifier;

When the adjacent Femto eNB judges that the carrier/subband is multiplexed with the Femto eNB to be allocated, whether the SINR calculated by the UE of the adjacent Femto eNB is greater than the preset second threshold, and if it is greater, send the The Femto eNB to be allocated returns a multiplexing response;

According to the multiplexing response, allocate the carrier/subband for the Femto eNB to be allocated.

An HMS that allocates frequency resources for Femto eNBs, including: an information acquisition module and a first resource allocation module; wherein,

The information acquisition module is used to obtain the RSRP and frequency resource usage of the Femto eNB managed by the HMS;

The first resource allocation module is configured to allocate the Femto eNB to be allocated with the adjacent Femto eNB when the RSRP of the adjacent Femto eNB of the Femto eNB is greater than a preset threshold after the Femto eNB to be allocated is powered on. Frequency orthogonal frequency resources used by Femto eNB.

A Femto eNB, including: a multiplexing application module and a multiplexing response module; wherein,

The multiplexing application module is used to determine whether the SINR calculated by the UE of the Femto eNB is greater than the preset first threshold when the Femto eNB and the adjacent Femto eNB multiplex the same carrier/subband, if greater, Then send a multiplexing application including the carrier/subband identifier to the adjacent Femto eNB;

The multiplexing response module is configured to receive multiplexing applications sent by adjacent Femto eNBs that include carrier/subband identifiers, and determine when multiplexing the carrier/subbands with the adjacent Femto eNBs, the Femto eNB's Whether the SINR calculated by the UE is greater than the preset second threshold, and if so, return a multiplexing response to the adjacent Femto eNB.

In summary, the method, HMS and Femto eNB proposed in the present invention, when allocating frequency resources for the Femto eNB to be allocated, first judge whether the RSRP of the adjacent Femto eNB is greater than the preset threshold, and if it is greater than the preset threshold, it indicates that the corresponding The adjacent Femto eNB may cause interference to the Femto eNB to be allocated, so according to the frequency resource usage status of the adjacent Femto eNB, the frequency resource orthogonal to the adjacent Femto eNB is allocated to the adjacent Femto eNB. Frequency resources allocated in this way can reduce interference between adjacent Femto eNBs.

Description of drawings

FIG. 1 is a schematic diagram of a bandwidth mode defined by 3GPP;

Fig. 2 is the implementation flowchart of Embodiment 1 of the present invention;

FIG. 3 is an overall interference diagram established by the HMS in Embodiment 1 of the present invention;

FIG. 4 is a partial interference diagram established by Femto eNB e in Embodiment 1 of the present invention;

Fig. 5 is the implementation flowchart of Embodiment 2 of the present invention;

FIG. 6 is an implementation flowchart of Embodiment 4 of the present invention;

FIG. 7 is a partial interference diagram established by Femto eNB e in Embodiment 4 of the present invention;

FIG. 8 is an implementation flow chart of Embodiment 5 of the present invention;

FIG. 9 is a flow chart of the implementation of Embodiment 6 of the present invention;

FIG. 10 is a schematic structural diagram of an HMS according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a Femto eNB according to an embodiment of the present invention.

Detailed ways

The present invention proposes a method for allocating frequency resources for Femto eNB. Assuming that all Femto eNBs are allocated a frequency with a bandwidth of 10MHz, the present invention divides this frequency into several carriers, and each Femto eNB can be assigned one or more carriers with different bandwidths. When carrying out carrier allocation, it is necessary to consider avoiding or minimizing interference between adjacent Femto eNBs. 1 shows a schematic diagram of the bandwidth mode defined by 3GPP. The allocation granularity of the carrier can be 1.4MHz, 3MHz, 5MHz or 10MHz. Of course, the present invention does not exclude other carriers that do not meet the bandwidth mode defined by the current 3GPP. In addition, the present invention can also be applied to dividing a carrier into several subbands (subbands), and assigning subbands to each Femto eNB.

In the present invention, the process of allocating frequency resources for Femto eNB is divided into two steps:

In step 1, all available frequency resources are allocated orthogonally to each Femto eNB. The so-called orthogonal allocation is to allocate non-overlapping frequency resources for adjacent Femto eNBs that may interfere with each other. When different frequency resources are allocated to each other, there will be no interference between adjacent Femto eNBs. The frequency resources allocated at this time are called orthogonal frequency resources.

In order to achieve this goal, it is first necessary to understand the adjacent Femto eNB that may interfere with a Femto eNB, and the frequency resources that the adjacent Femto eNB has used, and establish an interference graph based on these conditions.

Step 2: Determine whether each Femto eNB can share all or part of the frequency resources with adjacent Femto eNBs according to the specific location of the user equipment (UE) served by the Femto eNB. eNBs allocate common resources. This step is called multiplexing allocation, and the frequency resource allocated to Femto eNB is called multiplexing frequency resource.

The following takes Femto eNBi as an example to allocate carriers, and introduces the above two steps in detail with specific embodiments.

Embodiment one:

This embodiment introduces the first way of establishing the interference graph in step 1 (ie, orthogonal allocation).

The event that triggers orthogonal allocation is Femto eNB i power-on. After the Femto eNB i is powered on, it first selects one or more carriers so that the UEs served by it can perform initial access; since the Femto eNB does not know the distribution of the UEs to be served by it at this time, it must ensure that it is allocated The carrier is not used by adjacent Femto eNBs that may interfere with it, so the allocation at this time is orthogonal allocation.

Referring to Fig. 2, the implementation flowchart of Fig. 2 Embodiment 1 of the present invention includes the following steps:

Step 201: Femto eNB i searches for adjacent Femto eNBs (the search process is similar to UE), and determines the identity of adjacent Femto eNBs.

Step 202: Femto eNB i measures the reference signal received power (RSRP) of the searched neighbor Femto eNB.

Obviously, the larger the calculated RSRP of the adjacent Femto eNB, it means that if Femto eNB i is assigned the same carrier as the adjacent Femto eNB, the interference caused by the adjacent Femto eNB to Femto eNB i will be greater. Therefore, it is necessary to avoid allocating the same carrier for Femto eNB i as the neighboring Femto eNB during orthogonal allocation.

Step 203: Femto eNB i reports information such as the identity of the adjacent Femto eNB found and the measured RSRP of the adjacent Femto eNB to the home base station management system (HMS).

Step 204: The HMS sends the frequency resource usage of its neighboring Femto eNB to Femto eNBi according to the neighboring Femto eNB identifier provided by Femto eNB i.

Step 205: Femto eNB i establishes an interference graph according to the RSRP of the adjacent Femto eNB and the frequency resource usage of the adjacent Femto eNB. When the measured RSRP signal strength of nearby Femto eNBj is greater than a certain threshold, Femto eNB j may cause interference to Femto eNB i. The weight of the connecting line is RSRP.

And, according to the RSRP of the neighboring Femto eNBs of each Femto eNB it manages and the frequency resource usage of the neighboring Femto eNBs, the HMS can establish the overall interference graph of all the Femto eNBs it manages. And each Femto eNB only knows the Femto eNB information that may interfere with itself, that is, its interference graph is a local interference graph.

As shown in FIG. 3 , FIG. 3 is an overall interference diagram established by the HMS in Embodiment 1 of the present invention. The HMS manages a total of 7 Femto eNBs numbered a, b, c, d, e, f, and g, and has 6 carriers numbered 1, 2, 3, 4, 5, and 6 available for allocation. HMS has assigned carrier 1 and carrier 2 to a; carrier 3 to b; carrier 4 to c; carrier 5 to d; carrier 6 to f; carrier 1 and carrier 4 to g. After the Femto eNB e is powered on, the HMS establishes the overall interference diagram shown in Figure 3.

As shown in FIG. 4 , FIG. 4 is a partial interference diagram established by Femto eNB e in Embodiment 1 of the present invention, which is a part of FIG. 3 .

Of course, the establishment of the above-mentioned interference graph is only an implementation mode, and those skilled in the art can think of using other methods (such as establishing a table) to record the RSRP and frequency resource usage of adjacent Femto eNBs, which is not limited by the present invention.

Embodiment two:

This embodiment introduces the second way of establishing the interference graph in Step 1 (ie, orthogonal assignment). Referring to FIG. 5, FIG. 5 is an implementation flowchart of Embodiment 2 of the present invention, including the following steps:

Step 501: Femto eNB i searches for adjacent Femto eNBs, and determines the identity of the adjacent Femto eNBs.

Step 502: Femto eNB i sends a frequency resource usage query request to the adjacent Femto eNB according to the identity of the adjacent Femto eNB.

Step 503: The adjacent Femto eNB feeds back its own frequency resource usage to Femto eNB i.

Step 504: Femto eNB i measures RSRP of neighboring Femto eNBs.

Step 505: Femto eNB i establishes a local interference graph according to the frequency resource usage of the adjacent Femto eNB received in step 503 and the RSRP of the adjacent Femto eNB measured in step 504, as shown in Figure 4.

Step 506: HMS obtains the RSRP of adjacent Femto eNBs of all Femto eNBs it manages and the frequency resource usage of adjacent Femto eNBs, and can establish an overall interference graph of all Femto eNBs it manages, as shown in Figure 3.

The first and second embodiments above introduce two ways to establish an interference graph, and then, according to the established interference graph, an orthogonal frequency resource can be allocated to a Femto eNB. Specifically, there are three ways:

Embodiment three:

This embodiment introduces the first way of allocating orthogonal carriers in step one (ie, orthogonal allocation). Specifically include:

According to the established interference graph, multiple carriers are allocated to Femto eNB i, so that Femto eNB i and adjacent Femto eNBs that have an interference relationship with it use orthogonal carriers. This allocation can be performed centrally by the HMS or distributed by the Femto eNB.

For example, from the interference diagrams established in Figure 3 and Figure 4, it can be seen that adjacent Femto eNBs that may cause interference to Femto eNB e include a, d, and g, and the carriers used by a, d, and g include 1, 2, 4 and 5, therefore, in order not to cause interference, the carriers that can be orthogonally allocated to Femto eNB e are carrier 3 and carrier 6.

If the adjacent Femto eNB of Femto eNB e has already used all the carriers numbered 1 to 6, in this case, Femto eNB e can preempt the carrier of adjacent Femto eNB when the frequency resources of adjacent Femto eNB are sufficient for use ; Or, Femto eNB e can be allocated the carrier used by the adjacent Femto eNB (the farthest in Figure 2 is g) in the interference graph (the farthest is g) in the interference graph (the two multiplex the carrier), so that although Femto eNB e It is not orthogonal to the carrier used by Femto eNB g, but it can make the mutual interference between the two as small as possible.

When carrying out carrier allocation, consideration should be given to maximizing resource utilization, fairness, and minimizing modification to existing resource allocation.

In the third embodiment above, the process of allocating orthogonal carriers for Femto eNB i is completed at one time, and the other two processes of allocating orthogonal carriers to be introduced below will be carried out step by step in two stages.

Embodiment four:

This embodiment introduces the second way of allocating orthogonal carriers in step one (ie, orthogonal allocation).

In this embodiment, the process of allocating orthogonal carriers includes two stages, that is, an initial allocation stage and a sharing competition stage. Among them, the carrier allocated in the initial allocation stage is called the first priority carrier, which can be considered as the carrier that meets the minimum requirements of Femto eNB; the carrier allocated in the shared contention stage is called the second priority carrier, which is allocated when Femto eNB needs it , and will be returned to the shared resource pool when not needed. Referring to FIG. 6, FIG. 6 is an implementation flow chart of Embodiment 4 of the present invention, including the following steps:

Step 610: Initial allocation phase.

After the Femto eNB i is powered on, according to the status of the adjacent Femto eNB already using the carrier, assign the first priority carrier to the Femto eNB i.

The initial carrier allocation of Femto eNB i may have the following three situations:

Case 1:

After Femto eNB i is powered on, it finds an orthogonal carrier for allocation according to the interference graph, which is called the first priority carrier of Femto eNB i. Still taking Figure 3 as an example, the first priority carrier allocated for Femto eNB e may be carrier 3 or carrier 6.

Case two:

If Femto eNB i cannot find an orthogonal carrier for allocation, it can find one that has not been used by adjacent Femto eNB as the first priority according to the interference graph and the first priority carrier that each adjacent Femto eNB has used Carrier by carrier is assigned.

For example, FIG. 7 is a partial interference diagram established by Femto eNB e in Embodiment 4 of the present invention. The carriers used by adjacent Femto eNB a of Femto eNBe are carriers 1, 2 and 3, where carrier 1 is the first priority of a Carriers; the carriers used by d are carriers 5 and 6, of which carrier 5 is the first priority carrier of d; the carriers used by g are carriers 1 and 4, of which carrier 1 is the first priority carrier of g. It can be seen from the interference diagram that the neighboring Femto eNBs of Femto eNB e have used all carriers numbered 1 to 6, and Femto eNB e cannot find an orthogonal carrier for allocation; however, the first carrier number used by adjacent Femto eNBs is Priority carriers are carriers 1 and 5, therefore, Femto eNB e can choose one of carriers 2, 3, 4 and 6 as its first priority carrier.

If Femto eNB e selects carrier 2 as its first priority carrier, since carrier 2 is currently being used by Femto eNB a, Femto eNB e will ask Femto eNB a to give up using carrier 2, specifically including the following steps:

Femto eNB e reports carrier 2 to HMS, and sends frequency recovery signaling to Femto eNB a, requesting Femto eNB a to give up using carrier 2;

Femto eNB a recycles the signaling according to the frequency, and abandons the use of carrier 2; Femto eNB a notifies its adjacent Femto eNB of the abandonment of carrier 2;

Assign carrier 2 to Femto eNB e, and use carrier 2 as its first priority carrier.

The above allocation process can be performed interactively by the Femto eNB, or can be performed centrally by the HMS. During the entire allocation process, each Femto eNB will record and update the carrier usage of its adjacent Femto eNBs in real time, and HMS will also record and update the carrier usage of all Femto eNBs it manages in real time for carrier allocation.

Case three:

If Femto eNB i not only cannot find an orthogonal carrier for allocation, but all carriers have been used by neighboring Femto eNB as the first priority carrier, then:

Femto eNB i can give up access; or,

Select the carrier access with the least interference to yourself; or,

Report to HMS. HMS allocates a first priority carrier to Femto eNB i under the premise of ensuring that each Femto eNB has the first priority carrier and that the carrier allocation of other Femto eNBs is changed minimally. The HMS sends frequency allocation change notification messages to the Femto eNB whose carrier allocation has been changed and its adjacent Femto eNBs.

Step 610 completes the initial allocation, and assigns the first priority carrier to each Femto eNB; then proceeds to the Femto eNB sharing competition phase, that is, step 620, assigning the second priority carrier to the Femto eNB.

Step 620: Shared contention phase. The event that triggers sharing contention is: the UE average bandwidth of the Femto eNB is greater than/less than the threshold.

In the above step 620, after the first priority carrier is allocated to Femto eNB i, if there are still some carriers in the system that have not been allocated as the first priority carrier of any one of its adjacent Femto eNBs, then this part of the carrier is constituted A pool of shared resources.

Since the number of UEs actually served by Femto eNB i may change, when the number of UEs served by Femto eNB i increases, the average bandwidth of each UE will become smaller (the average bandwidth of UE is equal to the carrier bandwidth of Femto eNB i/the number of UEs ), when the average bandwidth of the UE is less than the minimum threshold, it is necessary to allocate more carriers to FemtoeNB i to meet the needs of the UE. At this time, one or more carriers can be selected from the shared resource pool and allocated to Femto eNB i as the second priority carrier of Femto eNB i.

When the number of UEs served by Femto eNB i decreases, the average bandwidth of each UE will increase. When the average bandwidth of UE is greater than the maximum threshold, some second priority carriers of Femto eNB i can be released and put into the shared resource pool , for sharing by other Femto eNBs.

When the Femto eNB i is powered off, all carriers used by the Femto eNB i can be taken back and put into the shared resource pool.

In the above process, when the condition of carrier allocation of each Femto eNB changes, it will notify its adjacent Femto eNB and HMS, and each Femto eNB and HMS in the system will record and update the above information in real time.

Embodiment five:

This embodiment introduces a third way of allocating orthogonal carriers in step one (ie, orthogonal allocation). In this embodiment, the process of allocating orthogonal carriers includes two phases, namely, the initial allocation phase and the exclusive contention phase. Among them, the carrier allocated in the initial allocation stage is called the first priority carrier, which can be considered as the carrier that meets the minimum requirements of Femto eNB; the carrier allocated in the exclusive competition stage is called the second priority carrier, when a Femto eNB needs more resources, it can apply for exclusive use of the second-priority carrier of its neighboring FemtoeNB. Referring to FIG. 8, FIG. 8 is a flow chart of the implementation of Embodiment 5 of the present invention, including the following steps:

Step 810: Initial allocation phase. This step is the same as step 610 and will not be repeated here.

Step 820: Monopoly competition phase. The event that triggers the exclusive contention is: the UE average bandwidth of the Femto eNB is less than the minimum threshold, or the total bandwidth of the Femto eNB is much smaller than the total bandwidth of the adjacent Femto eNB. Specifically, steps 821 to 825 are included.

Step 821: Femto eNB i judges whether its UE average bandwidth is less than the minimum threshold, and if it is less than, then execute step 822; or, Femto eNB i judges whether its own total bandwidth is much smaller than the total bandwidth of adjacent Femto eNBs, if yes, then Execute step 822.

Step 822: Femto eNB i sends an exclusive application to a neighboring Femto eNB, the exclusive application includes the UE average bandwidth of Femto eNB i and the identifier of the carrier requesting exclusive use.

Step 823: The adjacent Femto eNB calculates its UE average bandwidth, and judges whether it is much larger than the UE average bandwidth of the Femto eNB i contained in the exclusive application, if yes, execute step 824; otherwise, execute step 825. Due to the instability of the number of UEs, the calculated average bandwidth of UEs may change. In order to avoid the instability caused by this, the judgment can be repeated multiple times within a period of time. When the multiple judgments meet the requirements, perform the steps 824. We refer to this period of time as the unique response delay.

Step 824: The adjacent Femto eNB feeds back an exclusive response to Femto eNB i, releases the carrier that Femto eNB i requests to monopolize, and Femto eNB i monopolizes the carrier. End the current process.

Step 825: The adjacent Femto eNB feeds back the exclusive rejection to Femto eNB i.

It is worth pointing out that the two ways of allocating orthogonal carriers introduced in Embodiment 4 and Embodiment 5 can be used at the same time, and they do not conflict. For example, after a Femto eNB allocates the first priority carrier in the initial allocation stage, if the UE average bandwidth of the Femto eNB is less than the minimum threshold, it can first perform sharing competition, that is, to find out whether there is a carrier in the shared resource pool, and if so, Then allocate the carrier as the second priority carrier of the Femto eNB; if it does not exist, perform exclusive competition, that is, send an exclusive application to the adjacent Femto eNB on the premise that the trigger condition is met, and apply for exclusive use of the adjacent Femto eNB The carrier used.

Embodiment six:

This embodiment introduces the second step (that is, multiplexing allocation). Different from the orthogonal allocation in the first step, the multiplexing allocation is to appropriately allocate the same carrier for multiple adjacent Femto eNBs under the condition that the signal-to-interference and noise ratio (SINR) of the UE served by the Femto eNB can meet the requirements; The frequency of multiplexing allocation is more frequent, and is generally implemented by each Femto eNB in a distributed manner.

For the needs of subsequent descriptions, the SINR of the UE is first introduced, and the SINR of the UE is calculated using the following formula:

$\mathrm{<span\; class="notranslate">\; SINR</span>}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; RSRP</span>}}_{\mathrm{<span\; class="notranslate">\; serving</span>}}}{\mathrm{<span\; class="notranslate">\; N</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}{\mathrm{<span\; class="notranslate">\; RSRP</span>}}_{\mathrm{<span\; class="notranslate">\; non</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; serving</span>}}}<span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, RSRP _serving , RSRP _non-serving and N are all measured by UE;

RSRP _serving is the RSRP of Femto eNB i serving the UE;

RSRP _non-serving is the RSRP of the adjacent Femto eNB that uses the same carrier as Femto eNB i;

N is the noise power.

It can be seen from the above formula (1) that if the carrier already used by Femto eNBj is allocated for Femto eNB i multiplexing, then Femto eNBj will cause interference to UE of Femto eNB i, and the SINR calculated by UE of Femto eNB i will be reduced Small; when the SINR calculated by the UE is too small, it means that the Femto eNB i cannot provide services for the UE normally. Therefore, before Femto eNB i applies for multiplexing a certain carrier, it needs to first judge whether the SINR calculated by the UEs it serves is acceptable if the carrier is multiplexed. When the SINR calculated by all or part of the UEs is acceptable, Femto eNB i sends a multiplexing application to the adjacent Femto eNB that is using the carrier, otherwise there is no need for multiplexing. Here, whether the SINR of all or part of the UEs is acceptable, and how much of the UE's SINR is acceptable, involves policy issues in practical applications, which is not limited by the present invention.

Correspondingly, if Femto eNB i reuses and allocates the carrier already used by Femto eNBj, Femto eNB i will also cause interference to UE of Femto eNBj, so that the SINR calculated by UE of Femto eNBj decreases. Therefore, before Femto eNBj agrees with Femto eNB i to multiplex a certain carrier, it also needs to judge whether the SINR calculated by the UEs it serves is acceptable if the carrier is multiplexed. , Femto eNBj sends a multiplexing response to Femto eNB i, otherwise no multiplexing is provided.

The following is an introduction to the multiplexing allocation of Femto eNB i as an example, see Figure 9, Figure 9 is an implementation flowchart of Embodiment 6 of the present invention, including the following steps:

Step 901: initial judgment.

Judging the traffic demand of Femto eNB i, when the traffic demand is large, it means that Femto eNBi needs a larger bandwidth, so it is judged whether it is necessary to apply for more carriers, and perform step 902; when the traffic volume is small, such as Femto eNB When the UE of i performs voice communication, since the demand for bandwidth is low, there is no need to apply for a new carrier, and the current process ends.

The initial judgment can be considered as a trigger mechanism for multiplexing allocation. In general, the UE is more likely to move its location when performing voice communication, so this trigger mechanism can effectively avoid frequent changes in frequency allocation caused by the UE performing voice communication moving back and forth. Of course, the initial judgment in step 901 is not a necessary step, and step 902 can also be directly executed.

Step 902: Reuse the application.

The multiplexing application refers to the request to share a certain carrier with the adjacent Femto eNB.

According to the above formula (1), if all or some UEs in Femto eNB i calculate that the SINR is acceptable after using the carrier being used by the adjacent Femto eNB, then send multiplexing requests to all adjacent Femto eNBs using the carrier . The content of the multiplexing application includes: the identifier of the carrier that Femto eNB i requests multiplexing.

Step 903: multiplex the response.

Multiplexing response refers to agreeing to share a certain carrier with adjacent Femto eNBs.

After Femto eNBj receives the multiplexing application sent by Femto eNB i, according to the above formula (1), if all or part of UEs of Femto eNBj calculate that the SINR is still acceptable after Femto eNB i multiplexes a certain carrier, then send Femto eNB i Send a multiplexing response, agreeing to share the requested carrier with the adjacent Femto eNBi; otherwise, send a rejection signaling.

Due to the mobility of the UE, the calculated SINR will change due to the mobility of the UE. In order to avoid the instability caused by this, the UE can repeatedly calculate the SINR within a period of time. Femto eNBj sends a multiplexing response to FemtoeNB i when the SINR output is continuously acceptable. We call this period of time the multiplexing response delay.

Step 904: Multiplexing of carriers.

When Femto eNB i receives the multiplexing responses sent by all Femto eNBj, it allocates the carrier that requests multiplexing to Femto eNB i for use.

Step 905: Carrier recycling.

After the above steps 903 and 904, Femto eNB i multiplexes an orthogonal carrier assigned to Femto eNBj. When the UE distribution or UE members of Femto eNBj change, the SINR calculated by UE may change. When the SINR calculated by all or part of the UEs of Femto eNBj according to the above formula (1) is unacceptable, a recycle command is sent to Femto eNB i, requesting to recycle the carrier of Femto eNBj; the recycle command contains the carrier identity required to be reclaimed.

Femto eNB i gives up using the orthogonal carrier of Femto eNBj after receiving the recovery instruction.

Similar to the multiplexing response delay in step 903, in order to avoid unstable factors, the UE can repeatedly calculate the SINR for a period of time, and only when the calculated SINR continues to be unacceptable during this period, the Femto eNBj will report to the Femto eNB i sends a recycle command, we call this period of time the usage recycle delay.

The above six embodiments respectively introduce different implementation manners of each stage of frequency resource allocation. Among them, the orthogonal allocation is a global allocation, which is triggered when the Femto eNB is powered on or the UE average bandwidth of the Femto eNB is less than the minimum threshold, and the frequency of orthogonal allocation is low. The multiplexing allocation process can be centrally controlled by the HMS, or can be implemented in a distributed manner by each Femto eNB. The multiplexing allocation effectively controls the interference between adjacent Femto eNBs.

Multiplexing allocation can be regarded as a local adjustment. When the UE position and status of Femto eNB change, when the UE of Femto eNB calculates that the SINR after multiplexing the frequencies of adjacent Femto eNBs is acceptable, multiplexing is triggered. Use the allocation. Multiplexing allocation can be distributed by Femto eNB without reporting to HMS, so that frequency resources can be used flexibly and effectively.

It should be emphasized that the above-mentioned orthogonal allocation and multiplexing allocation are not only two steps related to each other, but also two independent frequency resource allocation methods; especially the multiplexing allocation method introduced in Embodiment 6 does not Relying on the orthogonal allocation method introduced in Embodiments 1 to 5 of the present invention, after using other methods to allocate orthogonal frequency resources to adjacent Femto eNBs, the method described in Embodiment 6 can still be used to multiplex adjacent Femto eNBs distribute.

In addition, the above-mentioned embodiments are all described by assigning carriers to Femto eNB as an example. The present invention is also applicable to the case of assigning each sub-band of a carrier to Femto eNB. The specific allocation method is the same as the method of allocating carriers in the above-mentioned embodiments. Same, no more details.

The present invention also proposes an HMS that allocates frequency resources for Femto eNBs, see FIG. 10, FIG. 10 is a schematic structural diagram of an HMS according to an embodiment of the present invention, including: an information acquisition module 1001 and a first resource allocation module 1002; wherein,

The information acquisition module 1001 is used to acquire the RSRP and frequency resource usage of the Femto eNB managed by the HMS;

The first resource allocation module 1002 is used to allocate the Femto eNB to be allocated with the adjacent Femto Frequency resources that are orthogonal to frequencies used by the eNB.

The above-mentioned first resource allocation module 1002 is used to allocate the first priority carrier/subband orthogonal to the frequency used by the adjacent Femto eNB for the Femto eNB to be allocated after the Femto eNB to be allocated is powered on.

The above-mentioned HMS may further include a second resource allocation module 1003, configured to allocate the Femto eNB to be allocated a second resource orthogonal to the frequency used by adjacent Femto eNBs when the UE average bandwidth of the Femto eNB to be allocated is less than a minimum threshold. Two priority carriers/subbands;

It is also used to release the second priority carrier/subband of the Femto eNB to be allocated when the UE average bandwidth of the Femto eNB to be allocated is greater than the maximum threshold.

The above-mentioned HMS may further include a third resource allocation module 1004, configured to be used when the UE average bandwidth of the Femto eNB to be allocated is less than the minimum threshold, and the UE average bandwidth of the adjacent Femto eNB is much greater than the UE average bandwidth of the Femto eNB to be allocated, Release the carrier/subband used by the adjacent Femto eNB, and allocate the carrier/subband to the Femto eNB to be allocated.

The embodiment of the present invention also proposes a Femto eNB, see FIG. 11, FIG. 11 is a schematic structural diagram of a Femto eNB according to an embodiment of the present invention, including: a multiplexing application module 1101 and a multiplexing response module 1102; wherein,

The multiplexing application module 1101 is used to determine whether the SINR calculated by the UE of the Femto eNB is greater than the preset first threshold when the Femto eNB and the adjacent Femto eNB multiplex the same carrier/subband, if greater, then Send a multiplexing application including the carrier/subband identifier to the adjacent Femto eNB;

The multiplexing response module 1102 is configured to receive a multiplexing application containing a carrier/subband identifier sent by an adjacent Femto eNB, and determine when the adjacent Femto eNB multiplexes the carrier/subband, the UE of the Femto eNB Whether the calculated SINR is greater than a preset second threshold, and if so, return a multiplexing response to the adjacent Femto eNB.

The above-mentioned Femto eNB may also include: a multiplexing recovery module 1103, which is used to judge whether the SINR calculated by the UE of the Femto eNB is less than the preset third threshold. instruction.

It can be seen from the above that the scheme of allocating frequency resources for Femto eNB proposed by the present invention can be divided into two steps, namely, orthogonal allocation and multiplexing allocation, and these two steps are independent schemes. When allocating orthogonal frequency resources for the Femto eNB to be allocated, first judge whether the RSRP of the adjacent Femto eNB is greater than the preset threshold. The frequency resource usage status of the adjacent Femto eNB, and allocate frequency resources orthogonal to the adjacent Femto eNB for the Femto eNB to be allocated. Frequency resources allocated in this way can reduce interference between adjacent Femto eNBs. When allocating multiplexed frequency resources for the Femto eNB to be allocated, according to the SINR calculated by the Femto eNB, it is judged whether part of the frequency resources can be multiplexed with the adjacent Femto eNB. Allocating frequency resources in this way can improve the utilization rate of frequency resources. The frequency resources are used flexibly and effectively.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (17)

1. A method of allocating frequency resources for a Femto base station, Femto eNB, the method comprising:

powering on a to-be-allocated Femto eNB, searching an adjacent Femto eNB of the to-be-allocated Femto eNB, acquiring Reference Signal Received Power (RSRP) and frequency resource use condition of the adjacent Femto eNB, and allocating a first priority carrier/subband orthogonal to the frequency used by the adjacent Femto eNB for the to-be-allocated Femto eNB when the RSRP of the adjacent Femto eNB is larger than a preset threshold;

judging whether the average bandwidth of the UE of the Femto eNB to be allocated is smaller than a minimum threshold, if so, allocating a second priority carrier/subband orthogonal to the frequency used by the adjacent Femto eNB for the Femto eNB to be allocated;

and judging whether the average bandwidth of the UE of the Femto eNB to be allocated is larger than a maximum threshold value or not, and if so, releasing the second priority carrier/sub-band of the Femto eNB to be allocated.

2. The method of claim 1, wherein the manner of obtaining the usage of the frequency resource of the neighboring Femto eNB is:

the Femto eNB to be allocated sends the identifier of the adjacent Femto eNB to a home base station management system (HMS);

and the HMS sends the frequency resource use condition of the adjacent Femto eNB to the Femto eNB to be allocated according to the identifier.

3. The method of claim 1, wherein the manner of obtaining the usage of the frequency resource of the neighboring Femto eNB is:

the to-be-allocated Femto eNB sends a frequency resource use condition query request to an adjacent Femto eNB according to the identifier of the adjacent Femto eNB;

and the adjacent Femto eNB feeds back the self frequency resource use condition to the Femto eNB to be allocated.

4. A method according to claim 1, 2 or 3, characterized in that the method further comprises:

when a Femto eNB to be allocated judges that the same carrier/sub-band is multiplexed with an adjacent Femto eNB, whether a signal to interference plus noise ratio (SINR) calculated by UE of the Femto eNB to be allocated is larger than a preset first threshold or not is judged, and if the SINR is larger than the preset first threshold, a multiplexing application containing the carrier/sub-band identification is sent to the adjacent Femto eNB;

the adjacent Femto eNB judges whether the SINR calculated by the UE of the adjacent Femto eNB is greater than a preset second threshold when the carrier/sub-band is multiplexed with the Femto eNB to be allocated, and if so, returns a multiplexing response to the Femto eNB to be allocated;

and multiplexing and allocating the carrier/sub-band for the Femto eNB to be allocated according to the multiplexing response.

5. The method of claim 4, wherein the determining whether the SINR calculated by the UE to which the Femto eNB is to be allocated is greater than the first threshold is: judging whether the SINR is continuously larger than a first threshold in a preset time period, and if so, judging that the SINR is larger than the first threshold;

the step of judging whether the SINR calculated by the UE of the adjacent Femto eNB is greater than a second threshold is as follows: and judging whether the SINR is continuously larger than a second threshold within a preset time period, and if so, judging that the SINR is larger than the second threshold.

6. The method of claim 4, wherein the allocating further comprises, after:

judging whether the SINR calculated by the UE of the adjacent Femto eNB is smaller than a preset third threshold or not, if so, sending a recovery instruction containing a carrier/subband identifier to the Femto eNB to be allocated by the adjacent Femto eNB;

and according to the recovery command, the Femto eNB to be allocated abandons the carrier/sub-band required to be recovered by the adjacent Femto eNB.

7. The method of claim 6, wherein said determining whether the SINR calculated by the UE of the neighboring Femto eNB is less than the third threshold is: and judging whether the SINR is continuously smaller than a third threshold in a preset time period, and if so, judging that the SINR is smaller than the third threshold.

8. A method of allocating frequency resources for a Femto base station, Femto eNB, the method comprising:

powering on a to-be-allocated Femto eNB, searching an adjacent Femto eNB of the to-be-allocated Femto eNB, acquiring Reference Signal Received Power (RSRP) and frequency resource use condition of the adjacent Femto eNB, and allocating a first priority carrier/subband orthogonal to the frequency used by the adjacent Femto eNB for the to-be-allocated Femto eNB when the RSRP of the adjacent Femto eNB is larger than a preset threshold;

judging whether the average bandwidth of UE of the Femto eNB to be allocated is smaller than a minimum threshold value or not, if so, sending an exclusive application to an adjacent Femto eNB, wherein the exclusive application comprises the average bandwidth of the UE of the Femto eNB to be allocated and a carrier/subband identifier requesting for exclusive application; or judging whether the total bandwidth of the Femto eNB to be allocated is far smaller than the total bandwidth of the adjacent Femto eNB, and if so, sending an exclusive application to the adjacent Femto eNB, wherein the exclusive application comprises the UE average bandwidth of the Femto eNB to be allocated and the carrier/subband identifier requesting the exclusive application.

9. The method of claim 8, wherein sending the exclusive application is further followed by:

the adjacent Femto eNB calculates the average bandwidth of UE of the adjacent Femto eNB, judges whether the average bandwidth is far larger than the average bandwidth of the UE of the Femto eNB to be allocated contained in the exclusive application, if so, feeds back an exclusive response to the Femto eNB to be allocated, and releases the carrier/sub-band which is requested to be exclusive by the Femto eNB;

and distributing the carrier/sub-band for the Femto eNB to be distributed.

10. The method of claim 8, wherein the manner of obtaining the frequency resource usage of the neighboring Femto eNB is:

the Femto eNB to be allocated sends the identifier of the adjacent Femto eNB to a home base station management system (HMS);

and the HMS sends the frequency resource use condition of the adjacent Femto eNB to the Femto eNB to be allocated according to the identifier.

11. The method of claim 8, wherein the manner of obtaining the frequency resource usage of the neighboring Femto eNB is:

the to-be-allocated Femto eNB sends a frequency resource use condition query request to an adjacent Femto eNB according to the identifier of the adjacent Femto eNB;

and the adjacent Femto eNB feeds back the self frequency resource use condition to the Femto eNB to be allocated.

12. The method according to any one of claims 8 to 11, characterized in that the method further comprises:

when a Femto eNB to be allocated judges that the same carrier/sub-band is multiplexed with an adjacent Femto eNB, whether a signal to interference plus noise ratio (SINR) calculated by UE of the Femto eNB to be allocated is larger than a preset first threshold or not is judged, and if the SINR is larger than the preset first threshold, a multiplexing application containing the carrier/sub-band identification is sent to the adjacent Femto eNB;

the adjacent Femto eNB judges whether the SINR calculated by the UE of the adjacent Femto eNB is greater than a preset second threshold when the carrier/sub-band is multiplexed with the Femto eNB to be allocated, and if so, returns a multiplexing response to the Femto eNB to be allocated;

and multiplexing and allocating the carrier/sub-band for the Femto eNB to be allocated according to the multiplexing response.

13. The method of claim 12, wherein the determining whether the SINR calculated by the UE to which the Femto eNB is to be allocated is greater than the first threshold is: judging whether the SINR is continuously larger than a first threshold in a preset time period, and if so, judging that the SINR is larger than the first threshold;

the step of judging whether the SINR calculated by the UE of the adjacent Femto eNB is greater than a second threshold is as follows: and judging whether the SINR is continuously larger than a second threshold within a preset time period, and if so, judging that the SINR is larger than the second threshold.

14. The method of claim 12, wherein the allocating further comprises, after:

judging whether the SINR calculated by the UE of the adjacent Femto eNB is smaller than a preset third threshold or not, if so, sending a recovery instruction containing a carrier/subband identifier to the Femto eNB to be allocated by the adjacent Femto eNB;

and according to the recovery command, the Femto eNB to be allocated abandons the carrier/sub-band required to be recovered by the adjacent Femto eNB.

15. The method of claim 14, wherein the determining whether the SINR calculated by the UE of the neighboring Femto eNB is less than the third threshold is: and judging whether the SINR is continuously smaller than a third threshold in a preset time period, and if so, judging that the SINR is smaller than the third threshold.

16. An HMS for allocating frequency resources for a Femto eNB, the HMS comprising: the system comprises an information acquisition module, a first resource allocation module and a second resource allocation module; wherein,

the information acquisition module is used for acquiring RSRP and frequency resource use condition of the Femto eNB managed by the HMS;

the first resource allocation module is used for allocating a first priority carrier/sub-band orthogonal to the frequency used by the adjacent Femto eNB for the Femto eNB to be allocated when the RSRP of the adjacent Femto eNB of the Femto eNB to be allocated is larger than a preset threshold value after the Femto eNB to be allocated is powered on;

the second resource allocation module is used for allocating a second priority carrier/sub-band orthogonal to the frequency used by the adjacent Femto eNB for the Femto eNB to be allocated when the average bandwidth of the UE of the Femto eNB to be allocated is smaller than a minimum threshold; and the second priority carrier/sub-band of the Femto eNB to be allocated is released when the average bandwidth of the UE of the Femto eNB to be allocated is greater than the maximum threshold.

17. An HMS for allocating frequency resources for a Femto eNB, the HMS comprising: the system comprises an information acquisition module, a first resource allocation module and a third resource allocation module; wherein,

the information acquisition module is used for acquiring RSRP and frequency resource use condition of the Femto eNB managed by the HMS;

the first resource allocation module is used for allocating a first priority carrier/sub-band orthogonal to the frequency used by the adjacent Femto eNB for the Femto eNB to be allocated when the RSRP of the adjacent Femto eNB of the Femto eNB to be allocated is larger than a preset threshold value after the Femto eNB to be allocated is powered on;

and the third resource allocation module is used for releasing the carrier/sub-band used by the adjacent Femto eNB and allocating the carrier/sub-band to the Femto eNB to be allocated when the average bandwidth of the UE of the Femto eNB to be allocated is smaller than the minimum threshold and the average bandwidth of the UE of the adjacent Femto eNB is far larger than the average bandwidth of the UE of the Femto eNB to be allocated.

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