WO2017084102A1 - 一种驻留节点的选择方法及用户设备 - Google Patents

一种驻留节点的选择方法及用户设备 Download PDF

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Publication number
WO2017084102A1
WO2017084102A1 PCT/CN2015/095202 CN2015095202W WO2017084102A1 WO 2017084102 A1 WO2017084102 A1 WO 2017084102A1 CN 2015095202 W CN2015095202 W CN 2015095202W WO 2017084102 A1 WO2017084102 A1 WO 2017084102A1
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Prior art keywords
node
candidate
nodes
backhaul link
resident
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PCT/CN2015/095202
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English (en)
French (fr)
Inventor
彭木根
晏志鹏
刘睿
李雷
杨常青
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华为技术有限公司
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Priority to PCT/CN2015/095202 priority Critical patent/WO2017084102A1/zh
Publication of WO2017084102A1 publication Critical patent/WO2017084102A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a method for selecting a resident node and a user equipment.
  • a heterogeneous network refers to deploying one or more micro cell base stations according to requirements within a macro cell coverage of a traditional base station, for small-area hotspot coverage.
  • the micro cell base station is a low transmit power radio access node (Low Power Nodes, LPN)
  • the macro cell base station is a high transmit power access node (High Power Nodes, HPN).
  • LPN Low Power Nodes
  • HPN High Power Nodes
  • a user equipment selects a camping node
  • the transmit power of the LPN is much lower than the transmit power of the HPN
  • the conventional maximum reference signal receiving power Reference Signal Receiving Power
  • the RSRP policy that is, the UE selects the node with the largest RSRP as the resident node
  • more UEs will reside in the HPN, so that the system cannot fully utilize the effect of improving the energy efficiency and improving the throughput brought by the deployment of the LPN.
  • 3GPP 3rd Generation Partnership Project
  • CRE Cell Region Expansion
  • the process of setting the offset value of the node is: the initial offset value of each node is 0, and when the number of UEs in the LPN is less than the preset threshold of the node, the The offset value of the node, when the number of UEs in the HPN is greater than the preset threshold of the node, the offset value of the node is lowered until the load between the HPN and the LPN is balanced.
  • the load between HPN and LPN is balanced to a certain extent, but there is still a problem of low load balance between LPNs, mainly because some LPNs have heavy loads, and it is difficult to avoid communication with other surrounding nodes. Interference, and the Ministry The load of the LPN is lighter, and its communication resources are difficult to be effectively utilized.
  • the embodiment of the invention discloses a method for selecting a resident node and a user equipment, which can improve the load balance between nodes.
  • a first aspect of the embodiments of the present invention discloses a method for selecting a resident node, including:
  • the user equipment performs signal measurement on each node to be tested, and obtains a reference signal received power RSRP of all the nodes to be tested, where the node to be tested is a node that the user equipment can detect in the current resident node, and the node to be tested It can be one or multiple, including low power nodes and high power nodes;
  • the user equipment selects a set of to-be-selected nodes from the all-to-be-tested nodes, and acquires node state information of each candidate node in the set of candidate nodes, where the RSRP of each candidate node is greater than a pre-selection Set a threshold;
  • the user equipment selects, from the set of candidate nodes, the candidate node with the largest sum of the RSRP and the Bias as a resident node.
  • the user equipment can set the offset value of each candidate node according to the node state information of each candidate node, and can adjust each candidate to be selected by using the offset value when selecting the resident node by using the maximum reference signal receiving power policy.
  • the probability that the node is selected as the resident node can balance the load between the high power node and the low power node and the low power node, and improve the load balance of each node and the resource utilization of the communication network system.
  • the node state information may include a remaining resource ratio ⁇ , an equivalent transmit power P TE , an equivalent transmission cost M E , and a backhaul link correction factor S of each candidate node, where the user
  • the specific manner in which the device obtains the offset value Bias of each candidate node according to the node state information of each candidate node may be:
  • the offset value calculated by the above method has a small offset value of the high power node, and the offset value of the low power node is large, and the low power node can also be reliable according to the backhaul link. To adjust the offset value of the low power node to balance the load between the nodes to some extent.
  • the specific manner in which the user equipment acquires node state information of each candidate node in the set of candidate nodes may be:
  • the road type may include a wired backhaul link and a wireless backhaul link;
  • the transmit power is used as the equivalent transmit power P TE of each candidate node, and the transmission cost is used as each of the to-be-selected The equivalent transmission cost of the node M E ; or,
  • the user equipment calculates the offset value of the candidate node, and the corresponding backhaul link correction factor S may take 1;
  • the node uses the wireless backhaul link.
  • the user equipment can further obtain the number N of the relay nodes in the wireless backhaul link, and the corresponding backhaul chain.
  • Road correction factor S can pass or Calculated by other methods. That is to say, the backhaul link correction factor S of the node using the wireless backhaul link is reduced as the number of the number of the relay nodes N is increased, and the specific calculation manner is not limited herein.
  • the equivalent transmit power and the equivalent transmission cost of the candidate node using the wired backhaul link are smaller than the candidate nodes using the wireless backhaul link, etc.
  • the effective transmission power and the equivalent transmission cost, and the backhaul link correction factor of the candidate node using the wired backhaul link is larger than the backhaul link correction factor of the candidate node using the wireless backhaul link.
  • the offset value of the candidate node using the wired backhaul link is larger than the offset value of the candidate node using the wireless backhaul link, so that the candidate node using the wired backhaul link can be increased.
  • the remaining resource ratio ⁇ of each node is affected by the type of the backhaul link used by each node. Therefore, each node calculates the remaining resource ratio ⁇ in the same manner as the candidate node calculates the remaining resource ratio ⁇ , which may be:
  • the remaining resource ratio ⁇ of each candidate node is with The minimum value; or,
  • the remaining resource ratio ⁇ of each candidate node is the remaining resource ratio ⁇ ' of the source relay node in the relay node set;
  • C is the remaining available capacity of the wired backhaul link
  • C 0 is the total capacity reference value of the backhaul link in the network system where each candidate node is located, where W is the each candidate node to be selected.
  • the available carrier remaining bandwidth, W 0 is the carrier total bandwidth reference value of the network system.
  • each node can adopt the above calculation manner when calculating the respective remaining resource ratios. It can be seen that the proportion of remaining resources obtained by the above method can reflect the ability of each node to carry new services more realistically and objectively.
  • the method further includes:
  • the user equipment camps on the resident node when the permission to park notification is received within the preset time period.
  • the method further includes:
  • the user equipment When the allowed parking notification is not received within the preset time period, the user equipment deletes the resident node from the candidate node set;
  • a second aspect of the embodiment of the present invention discloses a user equipment, including:
  • a processing module configured to perform signal measurement on each node to be tested, and obtain reference signal received power RSRP of all nodes to be tested;
  • the processing module is further configured to: select, from the all the nodes to be tested, a set of to-be-selected nodes, where the RSRP of each candidate node in the set of candidate nodes is greater than a preset threshold;
  • the processing module is further configured to acquire node state information of each candidate node in the set of candidate nodes;
  • the processing module is further configured to obtain, according to the node state information of each candidate node, an offset value Bias of each candidate node;
  • the processing module is further configured to select, from the set of candidate nodes, a candidate node that has the largest sum of the RSRP and the Bias as a resident node.
  • the user equipment can set the offset value of each candidate node according to the node state information of each candidate node, and can adjust each candidate to be selected by using the offset value when selecting the resident node by using the maximum reference signal receiving power policy.
  • the probability that the node is selected as the resident node can balance the load between the high power node and the low power node and the low power node, and improve the load balance of each node and the resource utilization of the communication network system.
  • the specific manner in which the processing module obtains node state information of each candidate node in the set of candidate nodes may be:
  • node state information of each candidate node in the set of candidate nodes includes a remaining resource ratio ⁇ of each candidate node, an equivalent transmit power P TE , and an equivalent transmission cost M E And a backhaul link correction factor S;
  • the specific manner in which the processing module obtains the offset value Bias of each candidate node according to the node state information of each candidate node may be:
  • the offset value calculated by the above method has a small offset value of the high power node, and the offset value of the low power node is large, and the low power node can also be reliable according to the backhaul link. To adjust the offset value of the low power node to balance the load between the nodes to some extent.
  • the specific manner in which the processing module obtains node state information of each candidate node in the set of candidate nodes may be:
  • the road type includes a wired backhaul link and a wireless backhaul link
  • the transmit power is used as the equivalent transmit power P TE of each candidate node, and the transmission cost is used as each of the to-be-selected The equivalent transmission cost of the node M E ; or,
  • the user equipment calculates the offset value of the candidate node, and the corresponding backhaul link correction factor S may take 1;
  • the node uses the wireless backhaul link.
  • the user equipment can further obtain the number N of the relay nodes in the wireless backhaul link, and the corresponding backhaul chain.
  • Road correction factor S can pass or Calculated by other methods. That is to say, the backhaul link correction factor S of the node using the wireless backhaul link is reduced as the number of the number of the relay nodes N is increased, and the specific calculation manner is not limited herein.
  • the equivalent transmit power and the equivalent transmission cost of the candidate node using the wired backhaul link are smaller than the candidate nodes using the wireless backhaul link, etc.
  • the effective transmission power and the equivalent transmission cost, and the backhaul link correction factor of the candidate node using the wired backhaul link is larger than the backhaul link correction factor of the candidate node using the wireless backhaul link.
  • the offset value of the candidate node using the wired backhaul link is larger than the offset value of the candidate node using the wireless backhaul link, so that the candidate node using the wired backhaul link can be increased.
  • the remaining resource ratio ⁇ of each node is affected by the type of the backhaul link used by each node. Therefore, each node calculates the remaining resource ratio ⁇ in the same manner as the candidate node calculates the remaining resource ratio ⁇ , which may be:
  • the remaining resource ratio ⁇ of each candidate node is with The minimum value; or,
  • the remaining resource ratio ⁇ of each candidate node is the remaining resource ratio ⁇ ' of the source relay node in the relay node set;
  • C is the remaining available capacity of the wired backhaul link
  • C 0 is the total capacity reference value of the backhaul link in the network system where each candidate node is located, where W is the each candidate node to be selected.
  • the available carrier remaining bandwidth, W 0 is the carrier total bandwidth reference value of the network system.
  • each node can adopt the above calculation manner when calculating the respective remaining resource ratios. It can be seen that the proportion of remaining resources obtained by the above method can reflect the ability of each node to carry new services more realistically and objectively.
  • the user equipment may further include a sending module and a receiving module, where:
  • the sending module is configured to send a resident request to the resident node
  • the receiving module is configured to receive an allowed parking notification that is returned by the resident node for the resident request;
  • the processing module is further configured to determine whether the receiving module receives the permission to stay notification within a preset time period
  • the processing module is further configured to camp to the resident node when the receiving module receives the permission to stay notification within the preset time period.
  • processing module is further configured to: when the receiving module does not receive the permission to hold the notification within the preset time period, use the resident node from the set of candidate nodes Delete
  • the processing module is further configured to determine whether the set of the candidate nodes that are deleted by the resident node is empty, and if not, perform the sum of the RSRP and the Bias from the set of candidate nodes to be selected.
  • the largest candidate node is the operation of the resident node.
  • the third aspect of the present invention discloses another user equipment, including a processor, a transmitter, and a receiver.
  • the processing module in the user equipment disclosed in the second aspect is equivalent to the processor in the user equipment, and the processor is The operation performed by the processing module may be performed; the sending module in the user equipment disclosed in the second aspect is equivalent to the transmitter in the user equipment, and then the sending module may perform the operations performed by the sending module;
  • the receiving module in the user equipment is equivalent to the receiver in the user equipment, and the receiver can perform the operations performed by the receiving module.
  • FIG. 1 is a schematic diagram of a network architecture disclosed in an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a method for selecting a resident node according to an embodiment of the present invention
  • FIG. 3 is a schematic flowchart of another method for selecting a resident node according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of another user equipment according to an embodiment of the present invention.
  • the embodiment of the invention discloses a method for selecting a resident node and a user equipment, which can improve the load balance between nodes. The details are described below separately.
  • FIG. 1 is a schematic diagram of a network architecture disclosed in an embodiment of the present invention.
  • a macro cell base station also referred to as a high power node, that is, c shown in FIG. 1
  • a micro cell base station also referred to as a low power node, that is, a and b shown in FIG. 1
  • the user equipment ie, d shown in FIG.
  • Figure 1 shows a low power node using a wired backhaul link
  • b is a low power node using a wireless backhaul link
  • f is a wireless backhaul link for wireless backhaul from b to a.
  • g is a communication link of the user equipment service, and is used to implement a communication connection of the user equipment to each node.
  • User equipment may include, but is not limited to, a mobile handset, a tablet, a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), and the like.
  • PDA Personal Digital Assistant
  • MID Mobile Internet Device
  • each node uploads node status information such as the respective transmit power and the type of the backhaul link used to the system information block of the communication network.
  • node status information such as the respective transmit power and the type of the backhaul link used to the system information block of the communication network.
  • the user equipment selects the resident node, Obtaining node state information of each node from the system information block through the communication link, so that the user equipment can calculate the offset value of each node according to the node state information of each node, and then the user equipment receives the power by giving a reference signal corresponding to each node. Add an offset value and combine the maximum reference signal received power strategy to achieve a more uniform selection of the resident node.
  • FIG. 2 is a schematic flowchart diagram of a method for selecting a resident node according to an embodiment of the present invention. As shown in FIG. 2, the method for selecting the resident node may include the following steps:
  • the user equipment performs signal measurement on each node to be tested, and obtains reference signal receiving power RSRP of all nodes to be tested.
  • the user equipment may perform signal measurement on the surrounding nodes to be tested at intervals, thereby finding the most suitable resident node, and may also test the surrounding to be tested after receiving the indication of the communication network system.
  • the node performs signal measurement, and may also perform signal measurement on the surrounding nodes to be tested when the signal receiving strength (ie, the reference signal receiving power) of the current resident node is lower than the preset signal strength, which is not limited in the embodiment of the present invention.
  • the node to be tested is a node that can detect a signal in the current camping node of the user equipment, and the node to be tested may be one or multiple, including a low power node and a high power node.
  • the reference signal receiving power (RSRP) corresponding to all the nodes to be tested is obtained.
  • the user equipment selects, from all the nodes to be tested, a set of to-be-selected nodes whose RSRP is greater than a preset threshold, and obtains node state information of each candidate node in the to-be-selected node set.
  • the user equipment after performing signal measurement on each node to be tested, the user equipment selects the nodes to be tested whose RSRP is greater than the preset threshold from all the nodes to be tested to form a set of nodes to be selected.
  • the preset threshold may be an RSRP threshold of each node to be tested, or may be an RSRP threshold of each user equipment, which is not limited in this embodiment of the present invention.
  • the user equipment after selecting the set of nodes to be selected, acquires node state information of each candidate node in the set of candidate nodes.
  • the node status information may include, but is not limited to, a remaining resource ratio ⁇ of each candidate node, an equivalent transmit power P TE , an equivalent transmission cost M E , and a backhaul link correction factor S.
  • the specific manner in which the user equipment obtains the node state information of each candidate node in the set of candidate nodes may include the following steps:
  • Step 11 For each candidate node in the set of nodes to be selected, obtain the remaining resource ratio ⁇ , the transmission power, the transmission cost, and the type of the backhaul link used by the candidate node.
  • each node uploads the respective transmit power, residual resource ratio ⁇ , and node type information to the system information block of the communication network, and updates the remaining resource ratio ⁇ in the system information block in time. Then, after selecting the to-be-selected node set from all the nodes to be tested, the user equipment obtains the transmit power and the remaining resource ratio ⁇ of each candidate node in the candidate node set from the system information block, and obtains each by acquiring each The node type information of the candidate node obtains the type of the backhaul link used by the candidate node.
  • the backhaul link type may include a wired backhaul link and a wireless backhaul link.
  • the node type used by each candidate node may be obtained by analyzing the node type information after the user equipment acquires the node type information of each candidate node, or may be the user equipment directly from the system information block.
  • the information obtained in the node type information is not limited in the embodiment of the present invention.
  • the transmission cost of each candidate node may be obtained by the user equipment from the system information block, or may be obtained by the user equipment according to the empirical value. Specifically, the user equipment may be configured according to each candidate node.
  • the type of the backhaul link used, the transmission cost of each candidate node is obtained, for example, the transmission cost of the candidate node using the same type of backhaul link is equal; for the convenience of calculation, the user equipment can also be in the communication network system.
  • the transmission cost of all the low-power nodes is considered to be equal, which is not limited in the embodiment of the present invention.
  • Step 12 When the candidate node uses a wired backhaul link, the transmit power of the candidate node as the equivalent transmit power P TE, and the transmission cost as equivalent to the transmission cost candidate M E node .
  • Non-ideal backhaul will limit the throughput that the node can achieve, reduce the communication quality of the node, and bring a large transmission power consumption overhead. Therefore, after the user equipment obtains the remaining resource ratio ⁇ , the transmission power, the transmission cost, and the type of the backhaul link used by each candidate node in the set of candidate nodes, if the candidate node uses the wired backhaul chain.
  • the equivalent transmit power P TE of the candidate node is the transmit power of the candidate node
  • the equivalent transmission cost M E of the candidate node is the transmission cost of the candidate node.
  • high power nodes use wired backhaul links, while nodes using wired backhaul links may also be low power nodes.
  • Step 13 In other words, when the candidate node uses the wireless backhaul link, the relay node set of the wireless backhaul link and the transmission power and transmission cost of each relay node in the relay node set are acquired.
  • the user equipment when the to-be-selected node uses the wireless backhaul link, the user equipment further acquires the wireless back of the candidate node based on the remaining resource ratio ⁇ , the transmission power, and the transmission cost of the candidate node.
  • the relay node constitutes a relay node set and the transmission power and transmission cost of each relay node in the relay node set. Since the node using the wireless backhaul link is a low power node, and the relay node in the wireless backhaul link is usually also a low power node, the user equipment can consider the transmit power of all low power nodes to be equal, and all low The transmission costs of the power nodes are equal, which is not limited in the embodiment of the present invention.
  • the relay node is a node that provides a relay for the access node (the candidate node) in the wireless backhaul link. To a certain extent, the relay node itself may also be an access node.
  • the relay node set of the wireless backhaul link and the transmission power and transmission cost of each relay node in the relay node set are acquired.
  • Step, and obtaining the remaining resource ratio ⁇ , the transmission power, and the transmission cost of the candidate node The steps of the type of the backhaul link used are performed at the same time, which is not limited in the embodiment of the present invention.
  • Step 14) using the sum of the transmit power of all the relay nodes in the set of relay nodes and the transmit power of the candidate node as the equivalent transmit power P TE of the candidate node, and transmitting the transmission cost of all the relay nodes.
  • the sum of the transmission costs of the candidate node is taken as the equivalent transmission cost M E of the candidate node.
  • the user equipment to the node after obtaining the state information of the candidate nodes, if the candidate node using a wireless backhaul link, which is the equivalent of the transmit power P TE candidate node
  • the sum of the transmit power of all the relay nodes and the transmit power of the candidate node, and the equivalent transmission cost of the candidate node is also the transmission cost of all the relay nodes in the wireless backhaul link of the candidate node and the The sum of the transmission costs of the candidate nodes.
  • the remaining resource ratio ⁇ of each node is affected by the type of the backhaul link used by each node. Therefore, each node calculates the remaining resource ratio ⁇ in the same manner as the candidate node calculates the remaining resource ratio ⁇ , which may be:
  • the remaining resource ratio ⁇ of the candidate node is with The minimum value
  • the remaining resource ratio ⁇ of the candidate node is the remaining resource ratio ⁇ ' of the source relay node in the relay node set.
  • C represents the remaining available capacity of the wired backhaul link of the candidate node
  • C 0 represents the total capacity reference value of the backhaul link in the network system where the candidate node is located
  • W represents The remaining bandwidth of the available carrier of the candidate node
  • W 0 represents the total carrier bandwidth reference value of the network system.
  • W 0 can be the total carrier bandwidth of the network system, or the total carrier bandwidth of any node, that is, W 0 is only a reference value of the total bandwidth of the network system, and the specific value is not in the embodiment of the present invention. Make a limit.
  • the node when the node uses a wired backhaul link, the node will compare the remaining available capacity of the wired backhaul link from the total capacity reference value of the network system, and the available carrier remaining bandwidth of the node. In the ratio of the total carrier bandwidth reference value of the network system, the minimum value is selected as the remaining resource ratio ⁇ of the node. For nodes using wired backhaul links, the remaining available capacity of the backhaul link The remaining available bandwidth of the node and the node can affect the ability of the node to carry new services. Therefore, the smaller of the two can more accurately reflect the ability of the node to carry new services.
  • the scheme may use the remaining resource ratio ⁇ ′ of the source relay node in the wireless backhaul link as the remaining resource ratio ⁇ of the node.
  • the source relay node is a relay node that is farthest from the node in the wireless backhaul link, and the source relay node itself is a node that uses a wired backhaul link. Therefore, the remaining resource ratio ⁇ ′ of the source relay node can be obtained by the method of obtaining the remaining resource ratio of the node using the wired backhaul link, which is not described herein again.
  • the remaining proportion of the backhaul link capacity and the carrier of the relay node for which the wireless backhaul is provided The resource availability ratio is the same, and the corresponding service also has corresponding carrier resource overhead at the relay node. Therefore, the remaining resource ratio ⁇ ' of the source relay node of this type of node is more likely to reflect the load condition of the node as the remaining resource ratio ⁇ of the node.
  • a node using a wired backhaul link can provide a relay for a node using a wireless backhaul link, while a node using a wireless backhaul link cannot provide a relay for a node using a wired backhaul link, of course.
  • Relays can be provided between nodes using wireless backhaul links.
  • the embodiment of the present invention may be, but is not limited to, applied in a scenario where only one backhaul link is used on one node.
  • the user equipment obtains an offset value Bias of the candidate node according to node state information of each candidate node.
  • the user equipment after acquiring the node state information of each candidate node in the to-be-selected node set, the user equipment obtains the respective offset values Bias according to the node state information of each candidate node.
  • the specific manner in which the user equipment obtains the offset value Bias of the node according to the node state information of each candidate node may be:
  • the offset value Bias of the candidate node is calculated according to the remaining resource ratio ⁇ , the equivalent transmit power P TE , the equivalent transmission cost M E , and the backhaul link correction factor S of each candidate node. Calculated as follows:
  • k is a normalization coefficient and is a fixed value used to unify the equivalent transmission cost M E and the equivalent transmit power P TE .
  • the remaining resource ratio ⁇ can reflect the load of the candidate node to a certain extent, and the backhaul link correction factor S mainly reflects the reliability of the backhaul link.
  • S * ⁇ under certain circumstances, be equivalent to the selected node, or equivalently the transmit power P TE transmission costs larger M E, the smaller the offset value to be the selected node; and the equivalent transmit power P TE or the like
  • M E the effective transmission cost
  • the user equipment calculates the offset value of the candidate node, and the corresponding backhaul link correction factor S may take 1;
  • the node uses the wireless backhaul link.
  • the user equipment can further obtain the number N of the relay nodes in the wireless backhaul link, and the corresponding backhaul chain.
  • Road correction factor S can pass or Calculated. That is to say, the backhaul link correction factor S of the node using the wireless backhaul link is reduced as the number of the number of the relay nodes N is increased, and the specific calculation manner is not limited herein.
  • the equivalent transmit power and equivalent transmission cost of the nodes using the wired backhaul link are both higher than those of the wireless backhaul link.
  • the equivalent transmit power and equivalent transmission cost of the node are small, and the backhaul link correction factor of the node using the wired backhaul link is also larger than the backhaul link correction factor of the node using the wireless backhaul link. Therefore, on the basis of the same transmission power and transmission cost of each low-power node, the offset value Bias of the node using the wired backhaul link is large, and thus the probability that the user equipment is selected as the resident node to a certain extent is required. Larger than nodes that use wireless backhaul links.
  • the user equipment when calculating the offset value of each candidate node in the set of nodes to be selected, the user equipment introduces factors such as the transmit power (ie, transmission power consumption) of the node, the transmission cost, and the like, in the embodiment of the present invention.
  • the transmit power ie, transmission power consumption
  • the transmission cost ie, transmission cost consumption
  • excessive transmission power or excessive cost overhead will reduce the offset value of the candidate node, thereby objectively reducing the probability that the user equipment selects such a node as a resident node, and at the same time The energy efficiency and cost efficiency performance of the communication network system is improved.
  • the user equipment when calculating the offset value of each candidate node, the user equipment also considers the type of the backhaul link used by the candidate node, and passes the equivalent transmit power P TE , the equivalent transmission cost M E , and the remaining resources.
  • the four parameters of the ratio ⁇ and the backhaul link correction factor S are characterized by the impact of the load, transmission quality, power consumption and cost overhead on the backhaul. It can be seen from the calculation formula of the above offset value that the offset value of the candidate node with insufficient backhaul capability, poor backhaul quality, large backhaul power consumption, and high backhaul cost is small, thereby being The probability that a user device is selected as a resident node is relatively low.
  • the ratio of residual resources ⁇ When calculating the ratio of residual resources ⁇ , the impact of both the backhaul resources and the access resources is considered jointly, which is beneficial to avoid the excessive number of services carried by the candidate nodes with insufficient backhaul capability.
  • the remaining resource ratio ⁇ of the candidate node using the wired backhaul link the ratio of the remaining available capacity to the total capacity reference value in the backhaul link of the candidate node, and the available carrier remaining bandwidth and carrier are taken.
  • the minimum of the ratio of the total bandwidth reference value can more intuitively reflect the ability of the candidate node to carry new services.
  • the user equipment selects, from the set of candidate nodes, the candidate node with the largest sum of RSRP and Bias as the resident node.
  • Bias j is the offset value of the candidate node j in the set of candidate nodes
  • RSRP j is the reference signal receiving power of the candidate node j in the set of candidate nodes.
  • the reference signal received power is greater than the pre-selected from all the nodes to be tested.
  • the set of candidate nodes of the reference signal receiving power threshold is set, and the node state information of each candidate node in the candidate node set is obtained, and the respective offset values are obtained according to the node state information of each candidate node, and finally the selection is performed.
  • the node to be selected is selected as the resident node with the largest sum of the reference signal received power and the offset value.
  • the user equipment may set the offset value of each candidate node according to the node state information of each candidate node, and may adjust the offset value when using the maximum reference signal receiving power policy to select the resident node.
  • the probability that each candidate node is selected as the resident node can balance the load between the high power node and the low power node and the low power node, and improve the load balance of each node and the resource utilization of the communication network system.
  • FIG. 3 is a schematic flowchart diagram of a method for selecting a resident node according to an embodiment of the present invention. As shown in FIG. 3, the selection method of the resident node may include the following steps:
  • the user equipment performs signal measurement on each node to be tested, and obtains reference signal receiving power RSRP of all nodes to be tested.
  • the user equipment selects, from all the nodes to be tested, a set of to-be-selected nodes whose RSRP is greater than a preset threshold, and obtains node state information of each candidate node in the to-be-selected node set.
  • the user equipment obtains an offset value Bias of the candidate node according to node state information of each candidate node.
  • the user equipment selects, from the set of candidate nodes, the candidate node with the largest sum of RSRP and Bias as the resident node, and sends a resident request to the resident node.
  • the user equipment after acquiring the offset value Bias of all the candidate nodes according to the node state information, the user equipment selects the candidate node with the largest sum of the reference signal received power and the offset value from the set of candidate nodes. As a resident node. At the same time, the user equipment also sends a resident request to the resident node.
  • step S305 The user equipment determines whether the permission of the resident node to return the parking request for the resident request is received within the preset time period. If yes, step S306 is performed; if no, step S307 to step S308 are performed.
  • the resident node after the user equipment sends a residing request to the residing node, if the resident node receives the residing request, the resident node returns a response to the residing request to the user equipment, that is, whether the user equipment is allowed. A notification message that resides on the resident node. Therefore, the user equipment determines whether a notification of the allowed presence returned by the resident node is received within a preset time period after the resident request is sent. If received, the user equipment will camp on the resident node; if it is not received, or receives a notification of the denial of residence returned by the resident node, the user equipment deletes the resident from the set of candidate nodes. The remaining node (that is, the candidate node with the largest sum of RSRP and Bias in the current set of nodes to be selected).
  • the user equipment resides on the resident node, and the process ends.
  • the user equipment when the user equipment receives the permission to stay notification returned by the resident node within a preset time period after sending the camping request, the user equipment camps on the resident node.
  • the user equipment deletes the resident node from the set of candidate nodes.
  • the user equipment when the user equipment does not receive the permission to park notification returned by the resident node within a preset time period after sending the camping request, or receives the preset time period after sending the camping request, the user equipment may delete the residing node from the set of candidate nodes, so that the user equipment continues to select the reference signal receiving power and the offset value from the set of candidate nodes.
  • the candidate node is to be the resident node.
  • step S308. The user equipment determines whether the set of candidate nodes after the resident node is deleted is empty. If yes, the process ends. If no, the process returns to step S304.
  • the user equipment may determine whether the set of the candidate nodes after deleting the resident node is empty, and if it is empty, it indicates that the user equipment is connected. If the entry fails, if it is not empty, it returns to the step of selecting the resident node that receives the reference signal received power and the offset value from the set of candidate nodes as the resident node.
  • the user equipment after calculating the offset value of each candidate node according to the state information of each candidate node in the to-be-selected node set, the user equipment selects a reference signal reception from the set of candidate nodes.
  • the candidate node with the largest sum of power and offset values acts as a resident node, and a camping request is sent to the candidate node.
  • the resident node allows the user equipment to camp, the user equipment resides to the resident node.
  • the resident node does not return a response notification of the resident request, or returns a denial of residence notification, the user equipment deletes the resident node from the set of candidate nodes and reselects the resident node from the set of candidate nodes.
  • the user equipment may set an offset value of each candidate node according to node state information of each candidate node, and may adopt an offset value when selecting a resident node by using a maximum reference signal receiving power policy.
  • the probability that each candidate node is selected as the resident node is adjusted, so that the load between the high power node and the low power node and the low power node can be balanced, and the load balance of each node and the resource utilization of the communication network system are improved.
  • FIG. 4 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment 400 can include the following modules:
  • the processing module 401 is configured to perform signal measurement on each node to be tested, and obtain reference signal received power RSRP of all nodes to be tested.
  • the processing module 401 is further configured to select, from all the nodes to be tested, a set of to-be-selected nodes whose RSRP is greater than a preset threshold.
  • the processing module 401 is further configured to acquire node state information of each candidate node in the set of candidate nodes.
  • the processing module 401 is further configured to obtain an offset value Bias of each candidate node according to node state information of each candidate node.
  • the processing module 401 is further configured to select, from the set of candidate nodes, the candidate node with the largest sum of RSRP and Bias as the resident node.
  • the node state information may include, but is not limited to, a remaining resource ratio ⁇ of each candidate node, an equivalent transmit power P TE , an equivalent transmission cost M E , and a backhaul link correction factor S, Therefore, the specific manner in which the processing module 401 obtains the offset value Bias of the candidate node according to the node state information of each candidate node may be:
  • the offset value Bias of the candidate node is calculated according to the remaining resource ratio ⁇ , the equivalent transmit power P TE , the equivalent transmission cost M E , and the backhaul link correction factor S of each candidate node. Calculated as follows:
  • k is a normalization coefficient and is a fixed value used to unify the equivalent transmission cost M E and the equivalent transmit power P TE .
  • the user equipment 400 may further include a sending module 402 and a receiving module 403, where:
  • the sending module 402 is configured to send a resident request to the resident node selected by the processing module 401.
  • the receiving module 403 is configured to receive an allowed parking notification returned by the resident node for the resident request.
  • the processing module 401 is further configured to determine whether the receiving module 403 receives the permission to stay notification within a preset time period.
  • the processing module 401 is further configured to: when the receiving module 403 receives the permission to stay notification within a preset time period, camping on the resident node.
  • the processing module 401 is further configured to: when the receiving module 403 does not receive the permission to hold the notification within a preset time period, the resident node is configured from the candidate node set. delete.
  • the processing module 401 is further configured to determine whether the set of to-be-selected nodes after the resident node is deleted is Empty, if no, re-select the candidate node with the largest sum of RSRP and Bias as the resident node from the set of candidate nodes.
  • the specific manner in which the processing module obtains the node state information of each candidate node in the set of candidate nodes may be:
  • the transmit power is used as the equivalent transmit power P TE of the candidate node, and the transmission cost is used as the equivalent transmission cost M E of the candidate node.
  • the candidate node uses the wireless backhaul link, acquiring the relay node set of the wireless backhaul link and the transmit power and transmission cost of each relay node in the relay node set, and the relay node
  • the sum of the transmit power of all the relay nodes in the set and the transmit power of the candidate node is taken as the equivalent transmit power P TE of the candidate node, and the transmission cost of all the relay nodes and the transmission cost of the candidate node are And the equivalent transmission cost M E as the candidate node.
  • each node calculates the remaining resource ratio ⁇ in the same manner as the candidate node calculates the remaining resource ratio ⁇ , which may be:
  • the remaining resource ratio ⁇ of the candidate node is with Minimum value in
  • the remaining resource ratio ⁇ of the candidate node is the remaining resource ratio ⁇ ' of the source relay node in the relay node set.
  • C represents the remaining available capacity of the wired backhaul link of the candidate node
  • C 0 represents the total capacity reference value of the backhaul link in the network system where the candidate node is located
  • W represents The remaining bandwidth of the available carrier of the candidate node
  • W 0 represents the total carrier bandwidth reference value of the network system.
  • the node when the node uses a wired backhaul link, the node will compare the remaining available capacity of the wired backhaul link from the total capacity reference value of the network system, and the available carrier remaining bandwidth of the node. In the ratio of the total carrier bandwidth reference value of the network system, the minimum value is selected as the node The remaining resource ratio ⁇ .
  • the remaining available capacity of the backhaul link and the remaining available bandwidth of the node affect the ability of the node to carry new services. Therefore, the smaller of the two is more realistic. Reflects the ability of the node to carry new services.
  • the scheme may use the remaining resource ratio ⁇ ′ of the source relay node in the wireless backhaul link as the remaining resource ratio ⁇ of the node.
  • the remaining resource ratio ⁇ can reflect the load of the candidate node to a certain extent.
  • S* ⁇ the larger the equivalent transmit power P TE or the equivalent transmission cost M E of the candidate node, the smaller the offset value of the candidate node; and the equivalent transmit power P TE or the like
  • the effective transmission cost M E is constant, the larger the remaining resource ratio ⁇ of the candidate node is, the larger the offset value corresponding to the candidate node is.
  • the equivalent transmit power and equivalent transmission cost of the nodes using the wired backhaul link are both higher than those of the wireless backhaul link.
  • the equivalent transmit power and equivalent transmission cost of the node are small, and the backhaul link correction factor of the node using the wired backhaul link is also larger than the backhaul link correction factor of the node using the wireless backhaul link. Therefore, on the basis of the same transmission power and transmission cost of each low-power node, the offset value Bias of the node using the wired backhaul link is large, and thus the probability of being selected as the resident node by the user equipment 400 to some extent. It is larger than the node that uses the wireless backhaul link.
  • the processing module 401 calculates the offset value of each candidate node in the set of nodes to be selected, the transmission power (ie, transmission power consumption) of the node, the transmission cost, and the like are introduced.
  • the transmission power ie, transmission power consumption
  • the transmission cost ie, transmission cost consumption
  • excessive transmission power or excessive cost overhead will reduce the offset value of the node, thereby objectively reducing the probability that the user equipment 400 selects such a node as a resident node, and at the same time, To a certain extent, the energy efficiency and cost efficiency performance of the communication network system is improved.
  • the processing module 401 when calculating the offset value of each candidate node, the processing module 401 also considers the type of the backhaul link used by the candidate node, by using the equivalent transmit power P TE , the equivalent transmission cost M E , and the remaining
  • the four parameters of resource ratio ⁇ and backhaul link correction factor S are characterized by load, transmission quality, power consumption and cost overhead. It can be seen from the calculation formula of the above offset value that the offset value of the candidate node with insufficient backhaul capability, poor backhaul quality, large backhaul power consumption, and high backhaul cost is small, thereby being The probability that user device 400 is selected as a resident node is relatively low.
  • the ratio of residual resources ⁇ When calculating the ratio of residual resources ⁇ , the impact of both the backhaul resources and the access resources is considered jointly, which is beneficial to avoid the excessive number of services carried by the candidate nodes with insufficient backhaul capability.
  • the remaining resource ratio ⁇ of the candidate node using the wired backhaul link the ratio of the remaining available capacity to the total capacity reference value in the backhaul link of the candidate node, and the available carrier remaining bandwidth and carrier are taken.
  • the minimum of the ratio of the total bandwidth reference value can more intuitively reflect the ability of the candidate node to carry new services.
  • the reference signal received power is selected from all the nodes to be tested. Predetermining the reference signal to receive the power threshold of the candidate node set, and obtaining the node state information of each candidate node in the candidate node set, obtaining the respective offset values according to the node state information of each candidate node, and finally from the The selected node in the selected node set is selected as the resident node with the largest sum of the received power and the offset value of the reference signal.
  • the user equipment may set the offset value of each candidate node according to the node state information of each candidate node, and may adjust the offset value when using the maximum reference signal receiving power policy to select the resident node.
  • the probability that each candidate node is selected as the resident node can balance the load between the high power node and the low power node and the low power node, and improve the load balance of each node and the resource utilization of the communication network system.
  • FIG. 5 is a schematic structural diagram of another user equipment according to an embodiment of the present invention.
  • the user equipment 500 can include at least one processor 501, such as a CPU, a transmitter 502, a receiver 503, and at least one bus 504, where:
  • the bus 504 may be a communication bus for implementing a communication connection between the processor 501, the transmitter 502, and the receiver 503, which is not limited in the embodiment of the present invention.
  • the processor 501 is configured to perform signal measurement on each node to be tested, and obtain reference signal received power RSRP of all nodes to be tested;
  • the processor 501 is further configured to: select, from all the nodes to be tested, a set of to-be-selected nodes whose RSRP is greater than a preset threshold, and obtain node state information of each candidate node in the to-be-selected node set;
  • the processor 501 is further configured to obtain, according to node state information of each candidate node, an offset value Bias of the candidate node;
  • the processor 501 is further configured to select, from the set of candidate nodes, a candidate node with the largest sum of RSRP and Bias as the resident node.
  • the node state information includes a remaining resource ratio ⁇ of each candidate node, an equivalent transmit power P TE , an equivalent transmission cost M E , and a backhaul link correction factor S;
  • the specific manner in which the processor 501 obtains the offset value Bias of the candidate node according to the node state information of each candidate node may be:
  • the offset value Bias of the candidate node is calculated according to the remaining resource ratio ⁇ , the equivalent transmit power P TE , the equivalent transmission cost M E , and the backhaul link correction factor S of each candidate node. Calculated as follows:
  • k is a normalization coefficient and is a fixed value used to unify the equivalent transmission cost M E and the equivalent transmit power P TE .
  • the specific manner in which the processor 501 obtains node state information of each candidate node in the set of candidate nodes may be:
  • the transmit power is used as the equivalent transmit power P TE of the candidate node, and the transmission cost is used as the equivalent transmission cost M E of the candidate node;
  • the candidate node uses the wireless backhaul link, acquiring the relay node set of the wireless backhaul link and the transmission power and transmission cost of each relay node in the relay node set, and the relay node
  • the sum of the transmit power of all the relay nodes in the set and the transmit power of the candidate node is taken as the equivalent transmit power P TE of the candidate node, and the transmission cost of all the relay nodes and the transmission cost of the candidate node are And the equivalent transmission cost M E as the candidate node.
  • the residual resource ratio ⁇ of each node is affected by the type of backhaul link used by each node. Therefore, each node calculates the ratio of its remaining resource ratio ⁇ to the node to be selected.
  • the way to calculate the remaining resource ratio ⁇ is the same, specifically:
  • the remaining resource ratio ⁇ of the candidate node is with Minimum value in
  • the remaining resource ratio ⁇ of the candidate node is the remaining resource ratio ⁇ ' of the source relay node in the relay node set.
  • C represents the remaining available capacity of the wired backhaul link of the candidate node
  • C 0 represents the total capacity reference value of the backhaul link in the network system where the candidate node is located
  • W represents The remaining bandwidth of the available carrier of the candidate node
  • W 0 represents the total carrier bandwidth reference value of the network system.
  • the node when the node uses a wired backhaul link, the node will compare the remaining available capacity of the wired backhaul link from the total capacity reference value of the network system, and the available carrier remaining bandwidth of the node. In the ratio of the total carrier bandwidth reference value of the network system, the minimum value is selected as the remaining resource ratio ⁇ of the node.
  • the remaining available capacity of the backhaul link and the remaining available bandwidth of the node affect the ability of the node to carry new services. Therefore, the smaller of the two is more realistic. Reflects the ability of the node to carry new services.
  • the scheme may use the remaining resource ratio ⁇ ′ of the source relay node in the wireless backhaul link as the remaining resource ratio ⁇ of the node.
  • the transmitter 502 is configured to send a camping request to the resident node after the processor 501 selects, from the set of candidate nodes, the candidate node with the largest sum of RSRP and Bias as the resident node.
  • the receiver 503 is configured to receive a permission to hold notification that the resident node returns for the resident request.
  • the processor 501 is further configured to determine whether the receiver 503 receives the permission to stay notification within a preset time period;
  • the processor 501 is further configured to camp on the resident node when the receiver 503 receives the permission to stay notification within a preset time period.
  • the processor 501 can also perform the following operations:
  • the resident node is deleted from the set of candidate nodes;
  • the candidate node set after the resident node is deleted is empty, and if not, the candidate node with the largest RSRP and Bias sum is selected from the set of candidate nodes as the resident.
  • the remaining resource ratio ⁇ can reflect the load of the candidate node to a certain extent.
  • S* ⁇ the larger the equivalent transmit power P TE or the equivalent transmission cost M E of the candidate node, the smaller the offset value of the candidate node; and the equivalent transmit power P TE or the like
  • the effective transmission cost M E is constant, the larger the remaining resource ratio ⁇ of the candidate node is, the larger the offset value corresponding to the candidate node is.
  • the equivalent transmit power and equivalent transmission cost of the nodes using the wired backhaul link are both higher than those of the wireless backhaul link.
  • the equivalent transmit power and equivalent transmission cost of the node are small, and the backhaul link correction factor of the node using the wired backhaul link is also larger than the backhaul link correction factor of the node using the wireless backhaul link. Therefore, on the basis that the transmission power and the transmission cost of each low-power node are the same, the offset value Bias of the node using the wired backhaul link is large, and thus the probability that the user equipment 500 is selected as the resident node to some extent. It is larger than the node that uses the wireless backhaul link.
  • the processor 501 when calculating the offset value of each candidate node in the set of nodes to be selected, the processor 501 introduces factors such as the transmit power (ie, transmission power consumption) of the node, the transmission cost, and the like, in the embodiment of the present invention.
  • the transmit power ie, transmission power consumption
  • the transmission cost ie, transmission cost consumption
  • excessive transmission power or excessive cost overhead may reduce the offset value of the node, thereby objectively reducing the probability that the user equipment 500 selects such a node as a resident node, and at the same time, To a certain extent, the energy efficiency and cost efficiency performance of the communication network system is improved.
  • the processor 501 when calculating the offset value of each candidate node, the processor 501 also considers the type of the backhaul link used by the candidate node, by using the equivalent transmit power P TE , the equivalent transmission cost M E , and the remaining The four parameters of resource ratio ⁇ and backhaul link correction factor S are characterized by load, transmission quality, power consumption and cost overhead. It can be seen from the calculation formula of the above offset value that the offset value of the candidate node with insufficient backhaul capability, poor backhaul quality, large backhaul power consumption, and high backhaul cost is small, thereby being The probability that user equipment 500 is selected as a resident node is relatively low.
  • the ratio ⁇ of remaining resources When calculating the ratio ⁇ of remaining resources, the effects of both return resources and access resources are considered together. It is beneficial to avoid the candidate nodes that have insufficient backhaul capability to carry too much traffic.
  • the remaining resource ratio ⁇ of the candidate node using the wired backhaul link the ratio of the remaining available capacity to the total capacity reference value in the backhaul link of the candidate node, and the available carrier remaining bandwidth and carrier are taken. The minimum of the ratio of the total bandwidth reference value can more intuitively reflect the ability of the candidate node to carry new services.
  • the reference signal received power is selected from all the nodes to be tested. Predetermining the reference signal to receive the power threshold of the candidate node set, and obtaining the node state information of each candidate node in the candidate node set, obtaining the respective offset values according to the node state information of each candidate node, and finally from the The selected node in the selected node set is selected as the resident node with the largest sum of the received power and the offset value of the reference signal.
  • the user equipment may set the offset value of each candidate node according to the node state information of each candidate node, and may adjust the offset value when using the maximum reference signal receiving power policy to select the resident node.
  • the probability that each candidate node is selected as the resident node can balance the load between the high power node and the low power node and the low power node, and improve the load balance of each node and the resource utilization of the communication network system.
  • the modules in the user equipment in the embodiment of the present invention may be combined, divided, and deleted according to actual needs.
  • the module in the embodiment of the present invention may be implemented by a general-purpose integrated circuit, such as a CPU (Central Processing Unit) or an ASIC (Application Specific Integrated Circuit).
  • a general-purpose integrated circuit such as a CPU (Central Processing Unit) or an ASIC (Application Specific Integrated Circuit).
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

本发明实施例公开了一种驻留节点的选择方法及用户设备，该方法包括：用户设备在对待测节点进行信号测量得到待测节点的参考信号接收功率RSRP后，会从待测节点中选取RSRP大于预设门限的待选节点集合，并获取待选节点集合中各待选节点的节点状态信息，根据各待选节点的节点状态信息得到各自对应的偏置值Bias，最后从待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留节点。实施本发明实施例，用户设备可以根据各节点的状态信息设置各节点的偏置值，在使用最大RSRP策略选择驻留节点时，能够通过偏置值调整各节点被选作驻留节点的概率，从而能够平衡高功率节点与低功率节点以及低功率节点之间的负载，提高各节点的负载均衡度和通信网络***的资源利用率。

Description

一种驻留节点的选择方法及用户设备 技术领域
本发明实施例涉及通信技术领域，具体涉及一种驻留节点的选择方法及用户设备。
背景技术
异构网络是指在传统基站覆盖的宏小区范围内，根据需求部署一个或者多个微小区基站，用于小范围的热点覆盖等。其中，微小区基站为低发射功率的无线接入节点(简称低功率节点，Low Power Nodes，LPN)，宏小区基站为高发射功率接入节点(简称高功率节点，High Power Nodes，HPN)。LPN与HPN共享移动通信***的专用频段，从而可以提高整个***的吞吐量以及整体频谱利用率。
在异构网络中，用户设备(User Equipment，UE)在选择驻留节点时，由于LPN的发射功率远远低于HPN的发射功率，如果采用传统的最大参考信号接收功率(Reference Signal Receiving Power，RSRP)策略(即UE选择RSRP最大的节点作为驻留节点)，就会有较多的UE驻留至HPN，使得***不能充分发挥部署LPN所带来的改善能效和提升吞吐量的作用。为了充分利用这些资源同时减少HPN的负载，第三代合作伙伴(3rdGeneration Partnership Project，3GPP)讨论组提出了CRE(Cell Region Expansion，小区区域扩展)的概念，即在LPN的接收功率上加一个偏置值，这样HPN的边缘UE就会有更大的机会驻留至LPN。
现有技术中，部分技术设置节点的偏置值的过程为：初始时各节点的偏置值均为0，当LPN中的UE数量小于该节点的预设门限值时，就增大该节点的偏置值，当HPN中的UE数量大于该节点的预设门限值时，就降低该节点的偏置值，直到HPN与LPN之间的负载达到平衡。通过这种方式在一定程度上平衡了HPN与LPN之间的负载，但是LPN之间仍然存在负载均衡度较低的问题，主要表现为部分LPN的负载较重，难以避免对周围其余节点的通信产生干扰，而部 分LPN的负载较轻，其通信资源则难以得到有效利用。
发明内容
本发明实施例公开了一种驻留节点的选择方法及用户设备，能够提高各节点之间的负载均衡度。
本发明实施例第一方面公开了一种驻留节点的选择方法，包括：
用户设备对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP，其中，待测节点为用户设备在当前驻留节点中所能检测到信号的节点，该待测节点可以为一个，也可以为多个，包括低功率节点和高功率节点；
所述用户设备从所述全部待测节点中选取待选节点集合，并获取所述待选节点集合中每个待选节点的节点状态信息，其中，所述每个待选节点的RSRP大于预设门限；
所述用户设备根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias；
所述用户设备从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点。
可见，用户设备可以根据每个待选节点的节点状态信息设置每个待选节点的偏置值，在使用最大参考信号接收功率策略选择驻留节点时，能够通过偏置值调整每个待选节点被选作驻留节点的概率，从而能够平衡高功率节点与低功率节点以及低功率节点之间的负载，提高各节点的负载均衡度和通信网络***的资源利用率。
可选的，所述节点状态信息可以包括所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S，那么所述用户设备根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias的具体方式可以为：
根据所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S计算所述每个待选节点的偏置值Bias，即
Figure PCTCN2015095202-appb-000001
其中，k为归一化系数。
可见，通过上述方式计算出的偏置值，高功率节点的偏置值较小，而低功率节点的偏置值较大，在低功率节点之间，也可以根据其回传链路的可靠性来调节低功率节点的偏置值，从而在一定程度上平衡了各节点之间的负载。
可选的，所述用户设备获取所述待选节点集合中每个待选节点的节点状态信息的具体方式可以为：
针对所述待选节点集合中的每个待选节点，获取所述每个待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型，其中，所述回传链路类型可以包括有线回传链路以及无线回传链路；
当所述每个待选节点使用有线回传链路时，将所述发射功率作为所述每个待选节点的等效发射功率PTE，并将所述传输成本作为所述每个待选节点的等效传输成本ME；或者，
当所述每个待选节点使用无线回传链路时，获取所述无线回传链路的中继节点集合以及所述中继节点集合中每个中继节点的发射功率和传输成本；
将所述中继节点集合中全部中继节点的发射功率与所述每个待选节点的发射功率之和作为所述每个待选节点的等效发射功率PTE，并将所述全部中继节点的传输成本与所述每个待选节点的传输成本之和作为所述每个待选节点的等效传输成本ME。
需要说明的是，如果待选节点使用的是有线回传链路，那么用户设备在计算该待选节点的偏置值时，对应的回传链路修正因子S可以取1；而如果待选节点使用的是无线回传链路，那么用户设备在计算该待选节点的偏置值时，用户设备可以进一步获取该无线回传链路中的中继节点的数量N，对应的回传链路修正因子S可以通过
Figure PCTCN2015095202-appb-000002
或
Figure PCTCN2015095202-appb-000003
等方式计算得到。也就是说，使用无线回传链路的节点的回传链路修正因子S会随着中继节点的数量N的增加而减小，其具体的计算方式本发明实施例在此不做限定。
可见，通过上述方式得到的节点状态信息中，使用有线回传链路的待选节点的等效发射功率和等效传输成本，均小于使用无线回传链路的待选节点的等 效发射功率和等效传输成本，而使用有线回传链路的待选节点的回传链路修正因子要比使用无线回传链路的待选节点的回传链路修正因子大。可以得出，使用有线回传链路的待选节点的偏置值要比使用无线回传链路的待选节点的偏置值大，从而可以增加使用有线回传链路的待选节点被选作驻留节点的概率。
可选的，各节点的剩余资源比例η受各节点使用的回传链路类型的影响。因此，各节点计算其剩余资源比例η的方式与待选节点计算其剩余资源比例η的方式相同，具体可以为：
当所述每个待选节点使用所述有线回传链路时，所述每个待选节点的剩余资源比例η为
Figure PCTCN2015095202-appb-000004
和
Figure PCTCN2015095202-appb-000005
中的最小值；或者，
当所述每个待选节点使用所述无线回传链路时，所述每个待选节点的剩余资源比例η为所述中继节点集合中的源中继节点的剩余资源比例η'；
其中，C为所述有线回传链路的剩余可用容量，C0为所述每个待选节点所在的网络***中回传链路的总容量参考值，W为所述每个待选节点的可用载波剩余带宽，W0为所述网络***的载波总带宽参考值。
当然，由于剩余资源比例η可以是由各个节点上传至***信息块中的，那么每个节点在计算各自的剩余资源比例时，均可以采用上述计算方式。可见，通过上述方式得到的剩余资源比例，能够较为真实客观的反映每个节点承载新业务的能力。
可选的，所述用户设备从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点之后，所述方法还包括：
所述用户设备向所述驻留节点发送驻留请求；
所述用户设备判断在预设时间段内是否接收到所述驻留节点针对所述驻留请求返回的允许驻留通知；
当在所述预设时间段内接收到所述允许驻留通知时，所述用户设备驻留至所述驻留节点。
可选的，所述方法还包括：
当在所述预设时间段内未接收到所述允许驻留通知时，所述用户设备将所述驻留节点从所述待选节点集合中删除；
所述用户设备判断所述驻留节点删除后的待选节点集合是否为空，若否，则返回执行所述从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点的步骤。
本发明实施例第二方面公开了一种用户设备，包括：
处理模块，用于对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP；
所述处理模块，还用于从所述全部待测节点中选取待选节点集合，所述待选节点集合中的每个待选节点的所述RSRP大于预设门限；
所述处理模块，还用于获取所述待选节点集合中每个待选节点的节点状态信息；
所述处理模块，还用于根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias；
所述处理模块，还用于从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点。
可见，用户设备可以根据每个待选节点的节点状态信息设置每个待选节点的偏置值，在使用最大参考信号接收功率策略选择驻留节点时，能够通过偏置值调整每个待选节点被选作驻留节点的概率，从而能够平衡高功率节点与低功率节点以及低功率节点之间的负载，提高各节点的负载均衡度和通信网络***的资源利用率。
可选的，所述处理模块获取所述待选节点集合中每个待选节点的节点状态信息的具体方式可以为：
获取所述待选节点集合中每个待选节点的节点状态信息，所述节点状态信息包括所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S；
所述处理模块根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias的具体方式可以为：
根据所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S计算所述每个待选节点的偏置值Bias，即
Figure PCTCN2015095202-appb-000006
其中，k为归一化系数。
可见，通过上述方式计算出的偏置值，高功率节点的偏置值较小，而低功率节点的偏置值较大，在低功率节点之间，也可以根据其回传链路的可靠性来调节低功率节点的偏置值，从而在一定程度上平衡了各节点之间的负载。
可选的，所述处理模块获取所述待选节点集合中每个待选节点的节点状态信息的具体方式可以为：
针对所述待选节点集合中的每个待选节点，获取所述每个待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型，其中，所述回传链路类型包括有线回传链路以及无线回传链路；
当所述每个待选节点使用有线回传链路时，将所述发射功率作为所述每个待选节点的等效发射功率PTE，并将所述传输成本作为所述每个待选节点的等效传输成本ME；或者，
当所述每个待选节点使用无线回传链路时，获取所述无线回传链路的中继节点集合以及所述中继节点集合中每个中继节点的发射功率和传输成本；
将所述中继节点集合中全部中继节点的发射功率与所述每个待选节点的发射功率之和作为所述每个待选节点的等效发射功率PTE，并将所述全部中继节点的传输成本与所述每个待选节点的传输成本之和作为所述每个待选节点的等效传输成本ME。
需要说明的是，如果待选节点使用的是有线回传链路，那么用户设备在计算该待选节点的偏置值时，对应的回传链路修正因子S可以取1；而如果待选节点使用的是无线回传链路，那么用户设备在计算该待选节点的偏置值时，用户设备可以进一步获取该无线回传链路中的中继节点的数量N，对应的回传链路修正因子S可以通过
Figure PCTCN2015095202-appb-000007
或
Figure PCTCN2015095202-appb-000008
等方式计算得到。也就是说，使用无线回传链路的节点的回传链路修正因子S会随着中继节点的数量N的增加而减小，其具体的计算方式本发明实施例在此不做限定。
可见，通过上述方式得到的节点状态信息中，使用有线回传链路的待选节点的等效发射功率和等效传输成本，均小于使用无线回传链路的待选节点的等 效发射功率和等效传输成本，而使用有线回传链路的待选节点的回传链路修正因子要比使用无线回传链路的待选节点的回传链路修正因子大。可以得出，使用有线回传链路的待选节点的偏置值要比使用无线回传链路的待选节点的偏置值大，从而可以增加使用有线回传链路的待选节点被选作驻留节点的概率。
可选的，各节点的剩余资源比例η受各节点使用的回传链路类型的影响。因此，各节点计算其剩余资源比例η的方式与待选节点计算其剩余资源比例η的方式相同，具体可以为：
当所述每个待选节点使用所述有线回传链路时，所述每个待选节点的剩余资源比例η为
Figure PCTCN2015095202-appb-000009
和
Figure PCTCN2015095202-appb-000010
中的最小值；或者，
当所述每个待选节点使用所述无线回传链路时，所述每个待选节点的剩余资源比例η为所述中继节点集合中的源中继节点的剩余资源比例η'；
其中，C为所述有线回传链路的剩余可用容量，C0为所述每个待选节点所在的网络***中回传链路的总容量参考值，W为所述每个待选节点的可用载波剩余带宽，W0为所述网络***的载波总带宽参考值。
当然，由于剩余资源比例η可以是由各个节点上传至***信息块中的，那么每个节点在计算各自的剩余资源比例时，均可以采用上述计算方式。可见，通过上述方式得到的剩余资源比例，能够较为真实客观的反映每个节点承载新业务的能力。
可选的，所述用户设备还可以包括发送模块以及接收模块，其中：
所述发送模块，用于向所述驻留节点发送驻留请求；
所述接收模块，用于接收所述驻留节点针对所述驻留请求返回的允许驻留通知；
所述处理模块，还用于判断所述接收模块在预设时间段内是否接收到所述允许驻留通知；
所述处理模块，还用于在所述接收模块在所述预设时间段内接收到所述允许驻留通知时，驻留至所述驻留节点。
可选的，所述处理模块，还用于在所述接收模块在所述预设时间段内未接收到所述允许驻留通知时，将所述驻留节点从所述待选节点集合中删除；
所述处理模块，还用于判断所述驻留节点删除后的待选节点集合是否为空，若否，则执行所述从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点的操作。
本发明第三方面公开了另一种用户设备，包括处理器、发送器以及接收器，其中，第二方面公开的用户设备中的处理模块相当于该用户设备中的处理器，那么该处理器可以执行上述处理模块所执行的操作；第二方面公开的用户设备中的发送模块相当于该用户设备中的发送器，那么该发送模块可以执行上述发送模块所执行的操作；第二方面公开的用户设备中的接收模块相当于该用户设备中的接收器，那么该接收器可以执行上述接收模块所执行的操作。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例公开的一种网络架构示意图；
图2是本发明实施例公开的一种驻留节点的选择方法的流程示意图；
图3是本发明实施例公开的另一种驻留节点的选择方法的流程示意图；
图4是本发明实施例公开的一种用户设备的结构示意图；
图5是本发明实施例公开的另一种用户设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例公开了一种驻留节点的选择方法及用户设备，能够提高各节点之间的负载均衡度。以下分别进行详细说明。
为了更好理解的本发明实施例公开的一种驻留节点的选择方法及用户设备，下面先对本发明实施例适用的网络架构进行描述。请参阅图1，图1是本发明实施例公开的一种网络架构示意图。在图1所示的网络架构中，可以包括宏小区基站(也称高功率节点，即图1所示的c)、微小区基站(也称低功率节点，即图1所示的a和b)以及用户设备(即图1所示的d)，低功率节点和用户设备在高功率节点的覆盖范围内随机分布，高功率节点和低功率节点可以使用相同的频谱资源，用户设备在选择驻留节点时，既可以选择高功率节点，又可以选择低功率节点。图1所示的a为使用有线回传链路的低功率节点，b为使用无线回传链路的低功率节点，f为无线回传链路，用于实现从b到a的无线回传，g为用户设备业务的通信链路，用于实现用户设备到各节点的通信连接。用户设备可以包括但不限于移动手机、平板电脑、个人数字助理(Personal Digital Assistant，PDA)、移动互联网设备(Mobile Internet Device，MID)等。
通过实施图1所示的网络架构，各节点会将各自的发射功率、使用的回传链路类型等节点状态信息上传至通信网络的***信息块中，用户设备在选择驻留节点时，会通过通信链路从***信息块中获取各节点的节点状态信息，以便用户设备能够根据各节点的节点状态信息计算出各节点的偏置值，然后用户设备通过给各节点对应的参考信号接收功率加上一个偏置值，并结合最大参考信号接收功率策略来实现较为均匀地选择驻留节点。
基于图1所示的网络架构，本发明实施例公开了一种驻留节点的选择方法。请参阅图2，图2是本发明实施例公开的一种驻留节点的选择方法的流程示意图。如图2所示，该驻留节点的选择方法可以包括以下步骤：
S201、用户设备对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP。
本发明实施例中，用户设备可以每间隔一段时间就对周围的待测节点进行信号测量，从而找出最合适的驻留节点，也可以在接收到通信网络***的指示后对周围的待测节点进行信号测量，还可以在当前驻留节点的信号接收强度(即参考信号接收功率)低于预设信号强度时对周围的待测节点进行信号测量，本发明实施例不做限定。
本发明实施例中，待测节点为用户设备在当前驻留节点中所能检测到信号的节点，该待测节点可以为一个，也可以为多个，包括低功率节点和高功率节点。用户设备在对每个待测节点进行信号测量之后，会得到全部待测节点对应的参考信号接收功率(Reference Signal Receiving Power，RSRP)。
S202、用户设备从全部待测节点中选取RSRP大于预设门限的待选节点集合，并获取待选节点集合中每个待选节点的节点状态信息。
本发明实施例中，用户设备在对每个待测节点进行信号测量之后，会从所有的待测节点中选取RSRP大于预设门限的待测节点组成待选节点集合。其中，该预设门限可以是每个待测节点的RSRP门限，也可以是每个用户设备的RSRP门限，本发明实施例不做限定。
本发明实施例中，用户设备在选取出待选节点集合后，会获取待选节点集合中每个待选节点的节点状态信息。其中，该节点状态信息可以包括但不限于每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S。
作为一种可行的实施方式，用户设备获取待选节点集合中每个待选节点的节点状态信息的具体方式可以包括以下步骤：
步骤11)针对待选节点集合中的每个待选节点，获取该待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型。
具体实现中，各节点会将各自的发射功率、剩余资源比例η和节点类型信息上传至通信网络的***信息块中，并在***信息块中的及时更新各自的剩余资源比例η。那么用户设备在从所有待测节点中选取出待选节点集合后，就会从***信息块中获取待选节点集合中每个待选节点的发射功率以及剩余资源比例η，并通过获取每个待选节点的节点类型信息得到该待选节点使用的回传链路类型。其中，回传链路类型可以包括有线回传链路和无线回传链路。
需要说明的是，每个待选节点使用的节点类型可以是用户设备在获取每个待选节点的节点类型信息后，对节点类型信息进行分析得到的，也可以是用户设备直接从***信息块中的节点类型信息中获取到的，本发明实施例不做限定。
而每个待选节点的传输成本可以是用户设备从***信息块中获取的，也可以是用户设备根据经验值估计得到，具体为：用户设备可以根据每个待选节点 使用的回传链路的类型，得到每个待选节点的传输成本，如使用同一类型的回传链路的待选节点的传输成本相等；为了便于计算，用户设备也可以将通信网络***中所有的低功率节点的传输成本视为相等，本发明实施例不做限定。
步骤12)当该待选节点使用有线回传链路时，将该发射功率作为该待选节点的等效发射功率PTE，并将该传输成本作为该待选节点的等效传输成本ME。
具体的，在异构网络***中，难以确保所有的节点均配备有较为理想的回传链路(即有线回传链路)，所以非理想回传链路(也就是本文所提到的无线回传)的影响是异构网络场景中无法回避的问题。非理想回传会限制节点所能实现的吞吐，降低节点的通信质量，并会带来较大的传输功耗开销。因此，用户设备在获取到待选节点集合中每个待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型后，如果该待选节点使用的是有线回传链路，该待选节点的等效发射功率PTE即为该待选节点的发射功率，而该待选节点的等效传输成本ME即为该待选节点的传输成本。
一般情况下，高功率节点使用的是有线回传链路，而使用有线回传链路的节点也可能为低功率节点。
步骤13)或者说，当该待选节点使用无线回传链路时，获取该无线回传链路的中继节点集合以及中继节点集合中每个中继节点的发射功率和传输成本。
具体实现中，当该待选节点使用无线回传链路时，用户设备在获取该待选节点的剩余资源比例η、发射功率、传输成本基础上，还会进一步获取该待选节点的无线回传链路中由中继节点组成中继节点集合以及该中继节点集合中每个中继节点的发射功率和传输成本。由于使用无线回传链路的节点为低功率节点，而无线回传链路中的中继节点通常也为低功率节点，所以用户设备可以视为所有低功率节点的发射功率相等，且所有低功率节点的传输成本相等，本发明实施例不做限定。其中，中继节点即为无线回传链路中为接入节点(该待选节点)提供中继的节点，在一定程度上，该中继节点自身也可以为接入节点。
需要说明的是，当该待选节点使用的是无线回传链路时，获取该无线回传链路的中继节点集合以及中继节点集合中每个中继节点的发射功率和传输成本的步骤，可以和获取该待选节点的剩余资源比例η、发射功率、传输成本以 及使用的回传链路类型的步骤同时执行，本发明实施例不做限定。
步骤14)将该中继节点集合中全部中继节点的发射功率与该待选节点的发射功率之和作为该待选节点的等效发射功率PTE，并将所有中继节点的传输成本与该待选节点的传输成本之和作为该待选节点的等效传输成本ME。
具体的，用户设备在获取到该待选节点的节点状态信息之后，如果该待选节点使用无线回传链路，其等效发射功率PTE即为该待选节点的无线回传链路中所有中继节点的发射功率与该待选节点的发射功率之和，而该待选节点的等效传输成本也为该待选节点的无线回传链路中所有中继节点的传输成本与该待选节点的传输成本之和。
作为另一种可能的实现方式，各节点的剩余资源比例η受各节点使用的回传链路类型的影响。因此，各节点计算其剩余资源比例η的方式与待选节点计算其剩余资源比例η的方式相同，具体可以为：
当该待选节点使用有线回传链路时，该待选节点的剩余资源比例η为
Figure PCTCN2015095202-appb-000011
和
Figure PCTCN2015095202-appb-000012
中的最小值；或者，
当该待选节点使用无线回传链路时，该待选节点的剩余资源比例η为中继节点集合中的源中继节点的剩余资源比例η'。
其中，C表征的是该待选节点的有线回传链路的剩余可用容量，C0表征的是该待选节点所在的网络***中回传链路的总容量参考值，W表征的是该待选节点的可用载波剩余带宽，W0表征的是网络***的载波总带宽参考值。
需要说明的是，所有节点(包括所有待测节点以及所有非待测节点)在计算各自的剩余资源比例时，W0的取值相等。具体的，W0既可以为网络***的载波总带宽，也可以为任意节点的载波总带宽，也就是说，W0仅为网络***总带宽的参考值，其具体取值本发明实施例不做限定。
针对某一节点来说，当该节点使用有线回传链路时，该节点会从有线回传链路的剩余可用容量与网络***的总容量参考值的比值，和该节点的可用载波剩余带宽与网络***的载波总带宽参考值的比值中，选取最小值作为该节点的剩余资源比例η。对于使用有线回传链路的节点来说，回传链路剩余可用容量 和节点的剩余可用带宽均会影响该节点承载新业务的能力，因此，取两者中的较小值较能真实的反映该节点承载新业务的能力。
而当该节点使用无线回传链路时，由于其承载新业务的能力不仅取决于其自身，还取决于无线回传链路中为该节点提供中继的各中继节点承载新业务的能力。因此，本方案在考虑该节点的剩余资源比例时，可以将无线回传链路中的源中继节点的剩余资源比例η'作为该节点的剩余资源比例η。其中，源中继节点为在无线回传链路中离该节点最远的中继节点，该源中继节点本身为使用有线回传链路的节点。因此，可以通过上述得到使用有线回传链路的节点的剩余资源比例的方式，得到该源中继节点的剩余资源比例η'，本发明实施例在此不再赘述。
进一步的，在未给无线回传划分专用频带的网络场景中，对于使用无线回传链路的节点而言，其回传链路容量剩余比例与为其提供无线回传的中继节点的载波资源可用比例相同，而对应业务在中继节点处也会有对应的载波资源开销。因此，将此类型的节点的源中继节点的剩余资源比例η'作为该节点的剩余资源比例η更能反映该节点的负载情况。
一般情况下，使用有线回传链路的节点可以为使用无线回传链路的节点提供中继，而使用无线回传链路的节点不能为使用有线回传链路的节点提供中继，当然，使用无线回传链路的节点之间是可以提供中继的。本发明实施例可以但不限于应用在一个节点只使用一条回传链路的场景下。
S203、用户设备根据每个待选节点的节点状态信息获得该待选节点的偏置值Bias。
本发明实施例中，用户设备在获取到待选节点集合中每个待选节点的节点状态信息后，会根据每个待选节点的节点状态信息分别获得各自的偏置值Bias。
可选的，用户设备根据每个待选节点的节点状态信息获得该节点的偏置值Bias的具体方式可以为：
根据每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S计算该待选节点的偏置值Bias。计算公式如下：
Figure PCTCN2015095202-appb-000013
其中，k为归一化系数，为一个固定值，用于统一等效传输成本ME和等效发射功率PTE的量纲。
本发明实施例中，剩余资源比例η在一定程度上可以反映该待选节点的负载，回传链路修正因子S主要反映的是回传链路的可靠性。在S*η一定的情况下，待选节点的等效发射功率PTE或者等效传输成本ME越大，该待选节点的偏置值越小；而在等效发射功率PTE或者等效传输成本ME一定的情况下，待选节点的剩余资源比例η越大，该待选节点对应的偏置值也越大。
需要说明的是，如果待选节点使用的是有线回传链路，那么用户设备在计算该待选节点的偏置值时，对应的回传链路修正因子S可以取1；而如果待选节点使用的是无线回传链路，那么用户设备在计算该待选节点的偏置值时，用户设备可以进一步获取该无线回传链路中的中继节点的数量N，对应的回传链路修正因子S可以通过
Figure PCTCN2015095202-appb-000014
或
Figure PCTCN2015095202-appb-000015
计算得到。也就是说，使用无线回传链路的节点的回传链路修正因子S会随着中继节点的数量N的增加而减小，其具体的计算方式本发明实施例在此不做限定。
另外，对于低功率节点来说，假设各低功率节点的发射功率和传输成本均相同，使用有线回传链路的节点的等效发射功率和等效传输成本均比使用无线回传链路的节点的等效发射功率和等效传输成本要小，且使用有线回传链路的节点的回传链路修正因子也比使用无线回传链路的节点的回传链路修正因子要大。因此，在各低功率节点的发射功率、传输成本相同的基础上，使用有线回传链路的节点的偏置值Bias要大，因而在一定程度上被用户设备选作驻留节点的概率要比使用无线回传链路的节点大。
本发明实施例中，用户设备在计算待选节点集合中每个待选节点的偏置值时，引入了节点的发射功率(即传输功耗)、传输成本等因素，在本发明实施例的计算方法中，过大的发射功率或过高的成本开销均会降低该待选节点的偏置值，从而在客观上降低了用户设备选择此类节点作为驻留节点的概率，同时在一定程度上提升了通信网络***的能效以及成本效率性能。
进一步的，在计算每个待选节点的偏置值时，用户设备还考虑了该待选节点使用的回传链路类型，通过等效发射功率PTE、等效传输成本ME、剩余资源 比例η以及回传链路修正因子S这四个参数，从负载、传输质量、功耗及成本开销四个方面对回传可能造成的影响进行了表征。从上述偏置值的计算公式中可以看出，回传能力不足、回传质量欠佳、回传功耗较大以及回传成本开销较高的待选节点的偏置值较小，从而被用户设备选作驻留节点的概率就相对较低。
在计算剩余资源比例η时，联合考虑了回传资源及接入资源两方面的影响，有利于避免回传能力不足的待选节点承载过多业务。同时，在计算使用有线回传链路的待选节点的剩余资源比例η时，取该待选节点的回传链路中剩余可用容量与总容量参考值的比值，和可用载波剩余带宽与载波总带宽参考值的比值中的最小值，能够较为直观的反映该待选节点承载新业务的能力。
S204、用户设备从待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留节点。
本发明实施例中，用户设备在获取到全部待选节点的偏置值之后，就会从待选节点集合中选取参考信号接收功率与偏置值之和最大的待选节点作为驻留节点，即ServingCell＝arg max{Biasj+RSRPj}。
其中，Biasj为待选节点集合中待选节点j的偏置值，RSRPj为待选节点集合中待选节点j的参考信号接收功率。
可见，在图2所描述的方法中，用户设备在对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率之后，会从全部待测节点中选取参考信号接收功率大于预设参考信号接收功率门限的待选节点集合，并获取待选节点集合中每个待选节点的节点状态信息，根据每个待选节点的节点状态信息得到各自的偏置值，最后从该选节点集合中选取参考信号接收功率与偏置值之和最大的待选节点作为驻留节点。实施本发明实施例，用户设备可以根据每个待选节点的节点状态信息设置每个待选节点的偏置值，在使用最大参考信号接收功率策略选择驻留节点时，能够通过偏置值调整每个待选节点被选作驻留节点的概率，从而能够平衡高功率节点与低功率节点以及低功率节点之间的负载，提高各节点的负载均衡度和通信网络***的资源利用率。
基于图1所示的网络架构，本发明实施例公开了另一种驻留节点的选择方 法。请参阅图3，图3是本发明实施例公开的一种驻留节点的选择方法的流程示意图。如图3所示，该驻留节点的选择方法可以包括以下步骤：
S301、用户设备对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP。
S302、用户设备从全部待测节点中选取RSRP大于预设门限的待选节点集合，并获取待选节点集合中每个待选节点的节点状态信息。
S303、用户设备根据每个待选节点的节点状态信息获得该待选节点的偏置值Bias。
S304、用户设备从待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留节点，并向该驻留节点发送驻留请求。
本发明实施例中，用户设备在根据节点状态信息获取到全部待选节点的偏置值Bias后，就会从待选节点集合中选取参考信号接收功率与偏置值之和最大的待选节点，以作为驻留节点。同时，用户设备还会向该驻留节点发送驻留请求。
S305、用户设备判断在预设时间段内是否接收到该驻留节点针对该驻留请求返回的允许驻留通知，若是，执行步骤S306；若否，执行步骤S307～步骤S308。
本发明实施例中，当用户设备向该驻留节点发送驻留请求后，驻留节点如果接收到该驻留请求，会向该用户设备返回该驻留请求的响应，即是否允许该用户设备驻留至该驻留节点的通知消息。因此，用户设备会判断在发送驻留请求后的预设时间段内是否接收到该驻留节点返回的允许驻留的通知。如果接收到，用户设备就会驻留至该驻留节点；如果未接收到，或者接收到该驻留节点返回的拒绝驻留的通知，那么用户设备就会从待选节点集合中删除该驻留节点(即当前待选节点集合中RSRP与Bias之和最大的待选节点)。
S306、用户设备驻留至该驻留节点，并结束本流程。
本发明实施例中，当用户设备在发送驻留请求后的预设时间段内接收到该驻留节点返回的允许驻留通知时，用户设备就会驻留至该驻留节点。
S307、用户设备将该驻留节点从待选节点集合中删除。
本发明实施例中，当用户设备在发送驻留请求后的预设时间段内未接收到该驻留节点返回的允许驻留通知，或者在发送驻留请求后的预设时间段内接收 到该驻留节点返回的拒绝驻留通知时，用户设备可以将该驻留节点从待选节点集合中删除，以便用户设备再继续从待选节点集合中选取参考信号接收功率和偏置值最大的待选节点以作为驻留节点。
S308、用户设备判断该驻留节点删除后的待选节点集合是否为空，若是，结束本流程；若否，返回执行步骤S304。
本发明实施例中，用户设备将该驻留节点从待选节点集合中删除后，可以判断删除该驻留节点后的待选节点集合是否为空，如果为空，就表明用户设备此次接入失败，如果不为空，就返回继续执行从待选节点集合中选取参考信号接收功率和偏置值最大的驻留节点作为驻留节点的步骤。
可见，在图3所描述的方法中，用户设备在根据待选节点集合中各待选节点的状态信息计算出各待选节点的偏置值后，会从待选节点集合中选取参考信号接收功率和偏置值之和最大的待选节点作为驻留节点，同时会向该待选节点发送驻留请求，当驻留节点允许用户设备驻留时，用户设备驻留至该驻留节点，当驻留节点未返回驻留请求的响应通知，或返回拒绝驻留通知时，用户设备会从待选节点集合中删除该驻留节点，并重新从待选节点集合中选取驻留节点。通过实施本发明实施例，用户设备可以根据每个待选节点的节点状态信息设置每个待选节点的偏置值，在使用最大参考信号接收功率策略选择驻留节点时，能够通过偏置值调整每个待选节点被选作驻留节点的概率，从而能够平衡高功率节点与低功率节点以及低功率节点之间的负载，提高各节点的负载均衡度和通信网络***的资源利用率。
基于图1所示的网络架构，本发明实施例公开了一种用户设备。请参阅图4，图4是本发明实施例公开的一种用户设备的结构示意图。如图4所示，该用户设备400可以包括以下模块：
处理模块401，用于对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP。
上述处理模块401，还用于从全部待测节点中选取RSRP大于预设门限的待选节点集合。
上述处理模块401，还用于获取该待选节点集合中每个待选节点的节点状态信息。
上述处理模块401，还用于根据每个待选节点的节点状态信息获得每个待选节点的偏置值Bias。
上述处理模块401，还用于从待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留节点。
作为一种可行的实施方式，该节点状态信息可以包括但不限于每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S，因此，处理模块401根据每个待选节点的节点状态信息获得该待选节点的偏置值Bias的具体方式可以为：
根据每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S计算该待选节点的偏置值Bias。计算公式如下：
Figure PCTCN2015095202-appb-000016
其中，k为归一化系数，为一个固定值，用于统一等效传输成本ME和等效发射功率PTE的量纲。
作为另一种可行的实施方式，用户设备400还可以包括发送模块402以及接收模块403，其中：
发送模块402，用于向上述处理模块401选取的驻留节点发送驻留请求。
接收模块403，用于接收该驻留节点针对该驻留请求返回的允许驻留通知。
上述处理模块401，还用于判断在预设时间段内上述接收模块403是否接收到该允许驻留通知。
上述处理模块401，还用于在上述接收模块403在预设时间段内接收到该允许驻留通知时，驻留至该驻留节点。
作为又一种可行的实施方式，上述处理模块401，还用于在上述接收模块403在预设时间段内未接收到该允许驻留通知时，将该驻留节点从该待选节点集合中删除。
上述处理模块401，还用于判断该驻留节点删除后的待选节点集合是否为 空，若否，则重新从该待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留节点。
作为又一种可行的实施方式，处理模块获取该待选节点集合中每个待选节点的节点状态信息的具体方式可以为：
针对待选节点集合中的每个待选节点，获取该待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型，其中，回传链路类型包括有线回传链路以及无线回传链路。
当该待选节点使用有线回传链路时，将该发射功率作为该待选节点的等效发射功率PTE，并将该传输成本作为该待选节点的等效传输成本ME。
而当该待选节点使用无线回传链路时，获取该无线回传链路的中继节点集合以及中继节点集合中每个中继节点的发射功率和传输成本，并将该中继节点集合中全部中继节点的发射功率与该待选节点的发射功率之和作为该待选节点的等效发射功率PTE，并将全部中继节点的传输成本与该待选节点的传输成本之和作为该待选节点的等效传输成本ME。
作为又一种可行的实施方式，由于各节点的剩余资源比例η受各节点使用的回传链路类型的影响。因此，各节点计算其剩余资源比例η的方式与待选节点计算其剩余资源比例η的方式相同，具体可以为：
当该待选节点使用有线回传链路时，该待选节点的剩余资源比例η为
Figure PCTCN2015095202-appb-000017
和
Figure PCTCN2015095202-appb-000018
中的最小值；
当该待选节点使用无线回传链路时，该待选节点的剩余资源比例η为中继节点集合中的源中继节点的剩余资源比例η'。
其中，C表征的是该待选节点的有线回传链路的剩余可用容量，C0表征的是该待选节点所在的网络***中回传链路的总容量参考值，W表征的是该待选节点的可用载波剩余带宽，W0表征的是网络***的载波总带宽参考值。
针对某一节点来说，当该节点使用有线回传链路时，该节点会从有线回传链路的剩余可用容量与网络***的总容量参考值的比值，和该节点的可用载波剩余带宽与网络***的载波总带宽参考值的比值中，选取最小值作为该节点的 剩余资源比例η。对于使用有线回传链路的节点来说，回传链路剩余可用容量和节点的剩余可用带宽均会影响该节点承载新业务的能力，因此，取两者中的较小值较能真实的反映该节点承载新业务的能力。
而当该节点使用无线回传链路时，由于其承载新业务的能力不仅取决于其自身，还取决于无线回传链路中为该节点提供中继的各中继节点承载新业务的能力。因此，本方案在考虑该节点的剩余资源比例时，可以将无线回传链路中的源中继节点的剩余资源比例η'作为该节点的剩余资源比例η。
本发明实施例中，由节点的偏置值Bias的计算公式可以看出，剩余资源比例η在一定程度上可以反映该待选节点的负载。在S*η一定的情况下，待选节点的等效发射功率PTE或者等效传输成本ME越大，该待选节点的偏置值越小；而在等效发射功率PTE或者等效传输成本ME一定的情况下，待选节点的剩余资源比例η越大，该待选节点对应的偏置值也越大。
另外，对于低功率节点来说，假设各低功率节点的发射功率和传输成本均相同，使用有线回传链路的节点的等效发射功率和等效传输成本均比使用无线回传链路的节点的等效发射功率和等效传输成本要小，且使用有线回传链路的节点的回传链路修正因子也比使用无线回传链路的节点的回传链路修正因子要大。因此，在各低功率节点的发射功率、传输成本相同的基础上，使用有线回传链路的节点的偏置值Bias要大，因而在一定程度上被用户设备400选作驻留节点的概率要比使用无线回传链路的节点大。
本发明实施例中，处理模块401在计算待选节点集合中每个待选节点的偏置值时，引入了节点的发射功率(即传输功耗)、传输成本等因素，在本发明实施例的计算方法中，过大的发射功率或过高的成本开销均会降低该节点的偏置值，从而在客观上降低了用户设备400选择此类节点作为驻留节点的概率，同时，在一定程度上提升了通信网络***的能效以及成本效率性能。
进一步的，在计算每个待选节点的偏置值时，处理模块401还考虑了该待选节点使用的回传链路类型，通过等效发射功率PTE、等效传输成本ME、剩余资源比例η以及回传链路修正因子S这四个参数，从负载、传输质量、功耗及成本开销四个方面对回传可能造成的影响进行了表征。从上述偏置值的计算公式中可以看出，回传能力不足、回传质量欠佳、回传功耗较大以及回传成本开 销较高的待选节点的偏置值较小，从而被用户设备400选作驻留节点的概率就相对较低。
在计算剩余资源比例η时，联合考虑了回传资源及接入资源两方面的影响，有利于避免回传能力不足的待选节点承载过多业务。同时，在计算使用有线回传链路的待选节点的剩余资源比例η时，取该待选节点的回传链路中剩余可用容量与总容量参考值的比值，和可用载波剩余带宽与载波总带宽参考值的比值中的最小值，能够较为直观的反映该待选节点承载新业务的能力。
可见，在图4所描述的用户设备中，用户设备在对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率之后，会从全部待测节点中选取参考信号接收功率大于预设参考信号接收功率门限的待选节点集合，并获取待选节点集合中每个待选节点的节点状态信息，根据每个待选节点的节点状态信息得到各自的偏置值，最后从该选节点集合中选取参考信号接收功率与偏置值之和最大的待选节点作为驻留节点。实施本发明实施例，用户设备可以根据每个待选节点的节点状态信息设置每个待选节点的偏置值，在使用最大参考信号接收功率策略选择驻留节点时，能够通过偏置值调整每个待选节点被选作驻留节点的概率，从而能够平衡高功率节点与低功率节点以及低功率节点之间的负载，提高各节点的负载均衡度和通信网络***的资源利用率。
基于图1所示的网络架构，本发明实施例公开了另一种用户设备。请参阅图5，图5是本发明实施例公开的另一种用户设备的结构示意图。如图5所示，该用户设备500可以包括：至少一个处理器501，如CPU，发送器502、接收器503和至少一个总线504，其中：
总线504可以为通信总线，用于实现处理器501、发送器502以及接收器503之间的通信连接，本发明实施例不做限定。
处理器501，用于对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP；
处理器501，还用于从全部待测节点中选取RSRP大于预设门限的待选节点集合，并获取待选节点集合中每个待选节点的节点状态信息；
处理器501，还用于根据每个待选节点的节点状态信息获得该待选节点的偏置值Bias；
处理器501，还用于从待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留节点。
在一些可行的实施方式中，节点状态信息包括每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S；
处理器501根据每个待选节点的节点状态信息获得该待选节点的偏置值Bias的具体方式可以为：
根据每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S计算该待选节点的偏置值Bias。计算公式如下：
Figure PCTCN2015095202-appb-000019
其中，k为归一化系数，为一个固定值，用于统一等效传输成本ME和等效发射功率PTE的量纲。
在一些可行的实施方式中，处理器501获取待选节点集合中每个待选节点的节点状态信息的具体方式可以为：
针对待选节点集合中的每个待选节点，获取该待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型，其中，回传链路类型包括有线回传链路以及无线回传链路；
当该待选节点使用有线回传链路时，将该发射功率作为该待选节点的等效发射功率PTE，并将该传输成本作为该待选节点的等效传输成本ME；
或者当该待选节点使用无线回传链路时，获取该无线回传链路的中继节点集合以及中继节点集合中每个中继节点的发射功率和传输成本，并将该中继节点集合中全部中继节点的发射功率与该待选节点的发射功率之和作为该待选节点的等效发射功率PTE，并将全部中继节点的传输成本与该待选节点的传输成本之和作为该待选节点的等效传输成本ME。
在一些可行的实施方式中，由于各节点的剩余资源比例η受各节点使用的回传链路类型的影响。因此，各节点计算其剩余资源比例η的方式与待选节点 计算其剩余资源比例η的方式相同，具体可以为：
当该待选节点使用有线回传链路时，该待选节点的剩余资源比例η为
Figure PCTCN2015095202-appb-000020
和
Figure PCTCN2015095202-appb-000021
中的最小值；
当该待选节点使用无线回传链路时，该待选节点的剩余资源比例η为中继节点集合中的源中继节点的剩余资源比例η'。
其中，C表征的是该待选节点的有线回传链路的剩余可用容量，C0表征的是该待选节点所在的网络***中回传链路的总容量参考值，W表征的是该待选节点的可用载波剩余带宽，W0表征的是网络***的载波总带宽参考值。
针对某一节点来说，当该节点使用有线回传链路时，该节点会从有线回传链路的剩余可用容量与网络***的总容量参考值的比值，和该节点的可用载波剩余带宽与网络***的载波总带宽参考值的比值中，选取最小值作为该节点的剩余资源比例η。对于使用有线回传链路的节点来说，回传链路剩余可用容量和节点的剩余可用带宽均会影响该节点承载新业务的能力，因此，取两者中的较小值较能真实的反映该节点承载新业务的能力。
而当该节点使用无线回传链路时，由于其承载新业务的能力不仅取决于其自身，还取决于无线回传链路中为该节点提供中继的各中继节点承载新业务的能力。因此，本方案在考虑该节点的剩余资源比例时，可以将无线回传链路中的源中继节点的剩余资源比例η'作为该节点的剩余资源比例η。
在一些可行的实施方式中，
发送器502，用于在处理器501从待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留节点之后，向该驻留节点发送驻留请求。
接收器503，用于接收该驻留节点针对该驻留请求返回的允许驻留通知。
处理器501，还用于判断接收器503在预设时间段内是否接收到该允许驻留通知；
处理器501，还用于在接收器503在预设时间段内接收到该允许驻留通知时，驻留至该驻留节点。
在一些可行的实施方式中，处理器501还可以执行以下操作：
在接收器503在预设时间段内未接收到该允许驻留通知时，将该驻留节点从待选节点集合中删除；
判断该驻留节点删除后的待选节点集合是否为空，若否，则重新从待选节点集合中选取RSRP与Bias之和最大的待选节点作为驻留。
本发明实施例中，由节点的偏置值Bias的计算公式可以看出，剩余资源比例η在一定程度上可以反映该待选节点的负载。在S*η一定的情况下，待选节点的等效发射功率PTE或者等效传输成本ME越大，该待选节点的偏置值越小；而在等效发射功率PTE或者等效传输成本ME一定的情况下，待选节点的剩余资源比例η越大，该待选节点对应的偏置值也越大。
另外，对于低功率节点来说，假设各低功率节点的发射功率和传输成本均相同，使用有线回传链路的节点的等效发射功率和等效传输成本均比使用无线回传链路的节点的等效发射功率和等效传输成本要小，且使用有线回传链路的节点的回传链路修正因子也比使用无线回传链路的节点的回传链路修正因子要大。因此，在各低功率节点的发射功率、传输成本相同的基础上，使用有线回传链路的节点的偏置值Bias要大，因而在一定程度上被用户设备500选作驻留节点的概率要比使用无线回传链路的节点大。
本发明实施例中，处理器501在计算待选节点集合中每个待选节点的偏置值时，引入了节点的发射功率(即传输功耗)、传输成本等因素，在本发明实施例的计算方法中，过大的发射功率或过高的成本开销均会降低该节点的偏置值，从而在客观上降低了用户设备500选择此类节点作为驻留节点的概率，同时，在一定程度上提升了通信网络***的能效以及成本效率性能。
进一步的，在计算每个待选节点的偏置值时，处理器501还考虑了该待选节点使用的回传链路类型，通过等效发射功率PTE、等效传输成本ME、剩余资源比例η以及回传链路修正因子S这四个参数，从负载、传输质量、功耗及成本开销四个方面对回传可能造成的影响进行了表征。从上述偏置值的计算公式中可以看出，回传能力不足、回传质量欠佳、回传功耗较大以及回传成本开销较高的待选节点的偏置值较小，从而被用户设备500选作驻留节点的概率就相对较低。
在计算剩余资源比例η时，联合考虑了回传资源及接入资源两方面的影响， 有利于避免回传能力不足的待选节点承载过多业务。同时，在计算使用有线回传链路的待选节点的剩余资源比例η时，取该待选节点的回传链路中剩余可用容量与总容量参考值的比值，和可用载波剩余带宽与载波总带宽参考值的比值中的最小值，能够较为直观的反映该待选节点承载新业务的能力。
可见，在图5所描述的用户设备中，用户设备在对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率之后，会从全部待测节点中选取参考信号接收功率大于预设参考信号接收功率门限的待选节点集合，并获取待选节点集合中每个待选节点的节点状态信息，根据每个待选节点的节点状态信息得到各自的偏置值，最后从该选节点集合中选取参考信号接收功率与偏置值之和最大的待选节点作为驻留节点。实施本发明实施例，用户设备可以根据每个待选节点的节点状态信息设置每个待选节点的偏置值，在使用最大参考信号接收功率策略选择驻留节点时，能够通过偏置值调整每个待选节点被选作驻留节点的概率，从而能够平衡高功率节点与低功率节点以及低功率节点之间的负载，提高各节点的负载均衡度和通信网络***的资源利用率。
需要说明的是，在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详细描述的部分，可以参见其他实施例的相关描述。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本发明所必须的。
本发明实施例方法中的步骤可以根据实际需要进行顺序调整、合并和删减。
本发明实施例用户设备中的模块可以根据实际需要进行合并、划分和删减。
本发明实施例中所述模块，可以通过通用集成电路，例如CPU(Central Processing Unit，中央处理器)，或通过ASIC(Application Specific Integrated Circuit，专用集成电路)来实现。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上对本发明实施例公开的一种驻留节点的选择方法及用户设备进行了详细介绍，本文中应用了具体实例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (12)

  1. 一种驻留节点的选择方法，其特征在于，包括：
    对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP；
    从所述全部待测节点中选取待选节点集合，并获取所述待选节点集合中每个待选节点的节点状态信息，所述每个待选节点的所述RSRP大于预设门限；
    根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias；
    从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点。
  2. 根据权利要求1所述的方法，其特征在于，所述节点状态信息包括所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S；
    所述根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias，包括：
    根据所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S计算所述每个待选节点的偏置值Bias，即
    Figure PCTCN2015095202-appb-100001
    其中，k为归一化系数。
  3. 根据权利要求2所述的方法，其特征在于，所述获取所述待选节点集合中每个待选节点的节点状态信息，包括：
    针对所述待选节点集合中的每个待选节点，获取所述每个待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型，其中，所述回传链路类型包括有线回传链路以及无线回传链路；
    当所述每个待选节点使用所述有线回传链路时，将所述发射功率作为所述每个待选节点的等效发射功率PTE，并将所述传输成本作为所述每个待选节点 的等效传输成本ME；或者，
    当所述每个待选节点使用所述无线回传链路时，获取所述无线回传链路的中继节点集合以及所述中继节点集合中每个中继节点的发射功率和传输成本；
    将所述中继节点集合中全部中继节点的发射功率与所述每个待选节点的发射功率之和作为所述每个待选节点的等效发射功率PTE，并将所述全部中继节点的传输成本与所述每个待选节点的传输成本之和作为所述每个待选节点的等效传输成本ME。
  4. 根据权利要求3所述的方法，其特征在于，
    当所述每个待选节点使用所述有线回传链路时，所述每个待选节点的剩余资源比例η为
    Figure PCTCN2015095202-appb-100002
    和
    Figure PCTCN2015095202-appb-100003
    中的最小值；或者，
    当所述每个待选节点使用所述无线回传链路时，所述每个待选节点的剩余资源比例η为所述中继节点集合中的源中继节点的剩余资源比例η'；
    其中，C为所述有线回传链路的剩余可用容量，C0为所述每个待选节点所在的网络***中回传链路的总容量参考值，W为所述每个待选节点的可用载波剩余带宽，W0为所述网络***的载波总带宽参考值。
  5. 根据权利要求1～4任一项所述的方法，其特征在于，所述从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点之后，所述方法还包括：
    向所述驻留节点发送驻留请求；
    判断在预设时间段内是否接收到所述驻留节点针对所述驻留请求返回的允许驻留通知；
    当在所述预设时间段内接收到所述允许驻留通知时，驻留至所述驻留节点。
  6. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    当在所述预设时间段内未接收到所述允许驻留通知时，将所述驻留节点从所述待选节点集合中删除；
    判断所述驻留节点删除后的待选节点集合是否为空，若否，则返回执行所述从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点的步骤。
  7. 一种用户设备，其特征在于，包括：
    处理模块，用于对每个待测节点进行信号测量，获取全部待测节点的参考信号接收功率RSRP；
    所述处理模块，还用于从所述全部待测节点中选取待选节点集合，所述待选节点集合中的每个待选节点的所述RSRP大于预设门限；
    所述处理模块，还用于获取所述待选节点集合中每个待选节点的节点状态信息；
    所述处理模块，还用于根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias；
    所述处理模块，还用于从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点。
  8. 根据权利要求7所述的用户设备，其特征在于，所述处理模块获取所述待选节点集合中每个待选节点的节点状态信息的具体方式为：
    获取所述待选节点集合中每个待选节点的节点状态信息，所述节点状态信息包括所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S；
    所述处理模块根据所述每个待选节点的节点状态信息获得所述每个待选节点的偏置值Bias的具体方式为：
    根据所述每个待选节点的剩余资源比例η、等效发射功率PTE、等效传输成本ME以及回传链路修正因子S计算所述每个待选节点的偏置值Bias，即
    Figure PCTCN2015095202-appb-100004
    其中，k为归一化系数。
  9. 根据权利要求8所述的用户设备，其特征在于，所述处理模块获取所述待选节点集合中每个待选节点的节点状态信息的具体方式为：
    针对所述待选节点集合中的每个待选节点，获取所述每个待选节点的剩余资源比例η、发射功率、传输成本以及使用的回传链路类型，其中，所述回传链路类型包括有线回传链路以及无线回传链路；
    当所述每个待选节点使用所述有线回传链路时，将所述发射功率作为所述每个待选节点的等效发射功率PTE，并将所述传输成本作为所述每个待选节点的等效传输成本ME；或者，
    当所述每个待选节点使用所述无线回传链路时，获取所述无线回传链路的中继节点集合以及所述中继节点集合中每个中继节点的发射功率和传输成本；
    将所述中继节点集合中全部中继节点的发射功率与所述每个待选节点的发射功率之和作为所述每个待选节点的等效发射功率PTE，并将所述全部中继节点的传输成本与所述每个待选节点的传输成本之和作为所述每个待选节点的等效传输成本ME。
  10. 根据权利要求9所述的用户设备，其特征在于，
    当所述每个待选节点使用所述有线回传链路时，所述每个待选节点的剩余资源比例η为
    Figure PCTCN2015095202-appb-100005
    和
    Figure PCTCN2015095202-appb-100006
    中的最小值；或者，
    当所述每个待选节点使用所述无线回传链路时，所述每个待选节点的剩余资源比例η为所述中继节点集合中的源中继节点的剩余资源比例η'；
    其中，C为所述有线回传链路的剩余可用容量，C0为所述每个待选节点所在的网络***中回传链路的总容量参考值，W为所述每个待选节点的可用载波剩余带宽，W0为所述网络***的载波总带宽参考值。
  11. 根据权利要求7～10任一项所述的用户设备，其特征在于，所述用户设备还包括发送模块以及接收模块，其中：
    所述发送模块，用于向所述驻留节点发送驻留请求；
    所述接收模块，用于接收所述驻留节点针对所述驻留请求返回的允许驻留 通知；
    所述处理模块，还用于判断所述接收模块在预设时间段内是否接收到所述允许驻留通知；
    所述处理模块，还用于在所述接收模块在所述预设时间段内接收到所述允许驻留通知时，驻留至所述驻留节点。
  12. 根据权利要求11所述的用户设备，其特征在于，
    所述处理模块，还用于在所述接收模块在所述预设时间段内未接收到所述允许驻留通知时，将所述驻留节点从所述待选节点集合中删除；
    所述处理模块，还用于判断所述驻留节点删除后的待选节点集合是否为空，若否，则执行所述从所述待选节点集合中选取所述RSRP与所述Bias之和最大的待选节点作为驻留节点的操作。
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