CN106162690A - A kind of femtocell power variable mechanism - Google Patents

Abstract

The invention discloses a femtocell power variable mechanism, which relates to the technical field of mobile communication. The power variable mechanism includes a power transmitting unit, and the power transmitting unit includes a service flow monitor, a power transmitting unit, a power multiplier, and a power transmitter The power will be automatically adjusted according to the multiplication factor provided by the power multiplier. The present invention is a femtocell power variable mechanism, the power variable mechanism is based on the user's use status, can probabilistically achieve the purpose of reducing interference and unnecessary handover, and can improve system performance to a certain extent; the power variable mechanism includes The trigger mechanism under low power can effectively increase the proportion of femtocells available for switching, and improve the utilization rate of femtocell wireless resources.

Description

A Femtocell Power Variable Mechanism

technical field

The invention relates to the technical field of mobile communication, in particular to a femtocell power variable mechanism.

Background technique

A femtocell is a small, cheap, and low-power base station, usually deployed by users, used in homes or offices, and connected to the wired core network, which can largely compensate for the blind spots in indoor coverage of macro cells More defects. The deployment of femtocell will have a certain impact on the traditional cellular network topology. The macro cell layer and the femto cell layer constitute two independent layers in the new network structure, so the network can also be called a two-layer network. The first layer is a traditional cellular network, and the second layer consists of several femtocells with small coverage that can be randomly planned and distributed. For femto base stations, they can be arbitrarily distributed within the coverage area of a larger cellular network (also known as an umbrella macro), while using the same frequency as the umbrella macro. However, the two-tier topology poses some problems and design challenges.

Since the services used by the users in each femto cell are different, the power of the femtocell under different service states can be adjusted according to the size of the service flow. When the service traffic level is very high, the femtocell must achieve a high transmission power to ensure that multiple services can be carried out at the same time; when the service traffic level is not high, the femtocell transmission power can be relatively reduced, as long as the current Business volume needs can be.

When the femtocell transmission power is low, the interference to surrounding base stations and mobile devices will be reduced, and at the same time, sufficient signal strength indications will not be given to passing mobile devices to make unnecessary handovers.

Contents of the invention

The purpose of the present invention is to provide a femtocell power variable mechanism, which can probabilistically achieve the purpose of reducing interference and unnecessary switching based on the user's use status, and can improve system performance to a certain extent.

The technical problem required to be solved by the present invention can be realized by the following technical solutions:

A femtocell power variable mechanism, the power variable mechanism includes a power transmission unit, and the power transmission unit includes a traffic flow monitor, a power transmission unit, and a power multiplier, so that the maximum transmission power of the femtocell is P _Tx,m ; The internal design of femtocell equipment is a described service flow monitor, and the service flow monitor monitors the current total user service flow usage level in this femtocell coverage area in real time, so that V _θ represents the full service flow level. If the current user's service volume is greater than or equal to this value, the transmit power of the femtocell must reach the maximum value it can achieve to ensure good communication quality; record the current traffic value of the femtocell as V _c , and a certain traffic level lasts for a period of time near a certain value Threshold time T, the service traffic monitor calculates the ratio of V _c to V _θ , and records this ratio as R, then there is Design a power multiplier inside the femtocell device. When the traffic flow monitor measures and calculates the R value of the current period of time, it will feed back the value to the power multiplier; the power transmitter unit will The multiplier provided by the multiplier automatically adjusts the power, let P _Tx,m be multiplied by R to obtain the actual transmit power, and record the actual transmit power as P _Tx , we have

Further, the setting of the full service traffic level value is performed by the operator according to the actual communication operation

The use of the situation is determined after calculation.

Further, the size of the threshold time T is specified by the operator.

Further, the power variable mechanism includes a trigger mechanism at low power.

The beneficial effect of the present invention: a femtocell power variable mechanism, the power variable mechanism is based on the user's use state, can probabilistically achieve the purpose of reducing interference and unnecessary handover, and can improve system performance to a certain extent; power The variable mechanism includes a trigger mechanism under low power, which effectively increases the proportion of femtocells available for switching and improves the utilization rate of femtocell wireless resources.

Description of drawings

Fig. 1 is a schematic structural diagram of a power transmitting unit of the present invention;

detailed description

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

A femtocell power variable mechanism, in conjunction with Fig. 1, the power variable mechanism includes a power transmission unit, and the power transmission unit includes a service flow monitor, a power transmission unit, and a power multiplier, so that the maximum transmission power of the femtocell is P _{Tx , m} ; design a described traffic flow monitor inside the femtocell equipment, and the traffic flow monitor monitors the current total user traffic usage level in this femtocell coverage area in real time, so that V _θ represents the full traffic flow level, if the current user uses When the business volume of the femtocell is greater than or equal to this value, the transmission power of the femtocell must reach the maximum value that can be achieved by itself to ensure good communication quality; the current business traffic value of the femtocell is recorded as V _c , and a certain traffic level is at a certain value lasts for a threshold time T, the traffic flow monitor calculates the ratio of V _c to V _θ , and records this ratio as R, then Design a power multiplier inside the femtocell device. When the traffic flow monitor measures and calculates the R value of the current period of time, it will feed back the value to the power multiplier; the power transmitter unit will The multiplier provided by the multiplier automatically adjusts the power, let P _Tx,m be multiplied by R to obtain the actual transmit power, and record the actual transmit power as P _Tx , we have

When the service traffic level is very high, the femtocell must achieve a high transmission power to ensure that multiple services can be carried out at the same time; when the service traffic level is not high, the femtocell transmission power can be relatively reduced, as long as the current Business volume needs can be. When the femtocell transmission power is low, the interference to surrounding base stations and mobile devices will be reduced, and at the same time, sufficient signal strength indications will not be given to passing mobile devices to make unnecessary handovers. Therefore, the variable power mechanism can probabilistically achieve the purpose of reducing interference and unnecessary handover based on the usage state of the user, and can improve system performance to a certain extent.

The setting of the full-service traffic level value is stipulated by the operator after calculation according to the actual communication application situation. The size of the threshold time T is specified by the operator.

The power variable mechanism includes a trigger mechanism at low power. When it is detected that the user equipment enters or is about to enter the coverage of a femtocell handover candidate set (for example, x set), but the proportion of femtocells in this set that is in a dormant (or ultra-low power state) is very high (for example, reaching 4 points 3 or more), the number of selectable base stations to be handed over will be relatively very small, and the success rate of handover will decrease instead. Based on this situation, the macro base station sends a handover request message to the resource control management unit, and the control unit can trigger most of the dormant or low-power femtocells in the x set to reach the working state according to the geographic coordinate position information, so that the selected The proportion of femtocells that can be switched in a given x set is increased to a certain extent.

A femtocell power variable mechanism, which is based on the user's usage status, can probabilistically achieve the purpose of reducing interference and unnecessary handover, and can improve system performance to a certain extent; the power variable mechanism includes low power The following trigger mechanism can effectively increase the proportion of femtocells available for switching, and improve the utilization rate of femtocell wireless resources.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. a femtocell power variable mechanism, it is characterised in that: power variable mechanism bag Including power emitting unit, described power emitting unit includes service traffics watch-dog, power emission Unit, power multiplier device, the maximum transmission power making femtocell is P_Tx,m；At femtocell Device interior one described service traffics watch-dog of design, service traffics watch-dog monitors in real time User traffic the most total in this femtocell overlay area uses level, makes V_θRepresent Full-service traffic level, if the portfolio that active user uses is more than or equal to this value, It is good that the transmitting power of femtocell must reach self accessible maximum guarantee Communication quality；Business Stream value current for femtocell is designated as V_c, a certain levels of traffic Continue for one section of threshold time T near certain value, service traffics watch-dog then calculates V_cWith V_θRatio, this ratio is designated as R, then hasSet at femtocell device interior Count a described power multiplier device unit, when service traffics watch-dog calculates ought be for the previous period R value size after, this value can be fed back to power multiplier device unit；Described power emission Device can be automatically adjusted watt level according to the multiplier factor that power multiplier device provides, and allows P_Tx,mIt is multiplied by Actual emission power, to obtain the size of actual emission power, is designated as P by R_Tx, have $P_{\mathrm{Tx}}=P_{\mathrm{Tx},m}\×R=P_{\mathrm{Tx},m}\×\frac{v_c}{v_{\mathrm{\θ}}}.$

2. according to a kind of femtocell power variable mechanism described in claim 1, its feature It is: setting of described full-service traffic level value is used feelings by operator according to actual communication Condition specified later through measuring and calculating.

3. according to a kind of femtocell power variable mechanism described in claim 1, its feature It is: the size of described threshold time T is specified by operator.

4. according to a kind of femtocell power variable mechanism described in claim 1, its feature It is: described power variable mechanism includes the trigger mechanism under low-power.