CN101557604B - Method for acquiring indication information of adjacent cell and wireless access network system - Google Patents
Method for acquiring indication information of adjacent cell and wireless access network system Download PDFInfo
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- CN101557604B CN101557604B CN200810091051A CN200810091051A CN101557604B CN 101557604 B CN101557604 B CN 101557604B CN 200810091051 A CN200810091051 A CN 200810091051A CN 200810091051 A CN200810091051 A CN 200810091051A CN 101557604 B CN101557604 B CN 101557604B
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- 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
Abstract
The invention discloses a method for acquiring indication information of an adjacent cell and a wireless access network system. The method comprises the following steps: a terminal acquires relevant information of a microcell keeping time synchronization with a macrocell from the macrocell; the terminal transmits detection signals of the adjacent cell according to the acquired relevant informationof the microcell; a wireless panel node of the microcell respectively receives the detection signals of the adjacent cell in the same frequency band and time slot, processes the detection signals of the adjacent cell to generate the indication information of the adjacent cell of an adjacent cell aggregation comprising the terminal and transmits the indication information of the adjacent cell to the terminal; and the terminal acquires the indication information of the adjacent cell. Each embodiment of the invention can solve the defects of long search time for acquiring a list of the adjacent cell and high power consumption existing in the prior art, and effectively shortens the time for acquiring the list of the adjacent cell by the terminal.
Description
Technical field
The present invention relates to wireless communication field, particularly, relate to a kind of acquisition methods and wireless access network system of indication information of adjacent cell.
Background technology
Wireless access network for the terminal is switched, functions such as minizone scheduling, Inter-Cell Interference Coordination, need dynamically grasp place, terminal adjacent cells of cells and gather (like adjacent cell list).In traditional wireless access network, indication information of adjacent cell is after Cell searching is accomplished at the terminal, and the base station that is belonged to the sub-district by the terminal issues adjacent set of cells to the terminal.Generally speaking; Sub-district number in the neighbor cell indication information that the base station issues (comprising the set of adjacent cell list) is in 10; The terminal is after obtaining indication information of adjacent cell; Pilot signal power to all sub-districts is surveyed, and the signal interference ratio of pilot signal is done further measurement greater than the sub-district of predetermined threshold, to obtain information such as cell identification number.
Can significantly shorten the time that the terminal is searched for adjacent sub-district although the base station issues adjacent set of cells, this search procedure still will take the time of several seconds, and subscriber equipment (UE) carries out expending time in within the 5s of cell identification.
Appearance along with the layering wireless access network; To there be a large amount of Microcells in the macrocell; For the terminal is switched, function such as minizone scheduling, Inter-Cell Interference Coordination; The adjacent macro cell of its place macrocell both need have been known in the terminal, also need know the adjacent micro sub-district of its place Microcell and this Microcell.Under layering wireless access planar network architecture, first kind of mode that issues indication information of adjacent cell is that each layer issues the adjacent set of cells of this layer respectively Cell searching is accomplished respectively in the terminal in two layers after to the terminal at present; The second way is the indication information of adjacent cell that obtains Microcell from grand coverage cell, and promptly macrocell layer issues the adjacent indication information such as sub-district indication set grade of microcell level.
Inventor of the present invention finds that in realizing process of the present invention there is following problem in the method that issues indication information of adjacent cell that adopts at present:
1) first kind when issuing indication information of adjacent cell respectively through two layers:
The terminal need be accomplished the Cell searching to macrocell and Microcell respectively, and this will make the Cell searching time at terminal and Cell searching power consumption be multiplied; And after need searching for neighbor cell according to adjacent set of cells, could obtain the information such as signal strength signal intensity of adjacent sub-district;
2) second kind when obtaining the indication information of adjacent cell of Microcell through macrocell:
Because the macrocell that the terminal is inserted is difficult to confirm the particular location at terminal; Therefore can only an adjacent set of cells indication information that comprise a lot of redundant Microcells be provided to the terminal; This makes the terminal after obtaining adjacent set of cells, expend a lot of times and power consumption and just can search out real effectively adjacent micro sub-district;
3) even the Cell searching to macrocell and Microcell is accomplished at the terminal respectively; And the adjacent macro cell that receives place, the terminal macrocell that macro cell base station and microcell base station issue respectively and terminal belong to after the adjacent micro set of cells of Microcell, and the terminal also will be multiplied to the search time and the power consumption of neighbor cell.
At title is No. 200510103059.4 patent application of " changing method of layering community mobile communication system "; And be in No. 200610005624.8 application of " hierarchical cell reselection method in the mobile communications network " at title; Though need to use indication information of adjacent cell such as adjacent set of cells, these two patent applications are all less than obtaining the method for indication information of adjacent cell for the terminal that makes new advances.
Summary of the invention
The objective of the invention is to propose a kind of method and wireless access network system that obtains indication information of adjacent cell, to shorten the time that the terminal obtains indication information of adjacent cell to the defective that search time is long, power consumption is big of obtaining indication information of adjacent cell in the prior art.
For realizing above-mentioned purpose, according to an aspect of the present invention, a kind of acquisition methods of indication information of adjacent cell is provided.
According to the acquisition methods of the indication information of adjacent cell of the embodiment of the invention, be applied to comprise the layering wireless access network of several Microcells in macrocell and the macrocell, this method comprises:
Terminal from macro is obtained the relevant information with synchronous Microcell of macrocell retention time; Adjacent sub-district detectable signal is sent according to the relevant information of the Microcell that obtains in the terminal; The radio node of Microcell receives adjacent sub-district detectable signal respectively in identical frequency band and time slot, and adjacent sub-district detectable signal is handled, and generates the indication information of adjacent cell of the adjacent set of cells that comprises the terminal, and indication information of adjacent cell is sent to the terminal; The terminal obtains indication information of adjacent cell.
Terminal from macro obtain with the relevant information of synchronous Microcell of macrocell retention time can for: the Cell searching to macrocell is accomplished at the terminal, inserts after the broadcast channel of macrocell, obtains the relevant information of Microcell from the broadcast channel of macrocell; Or the terminal is in the process that receives the macrocell service, obtains the relevant information of Microcell periodically or under trigger event triggering from the broadcast channel of macrocell.
Send before the detectable signal of adjacent sub-district at the terminal, can also comprise: the terminal uses the synchronizing channel of Microcell that the launch time and/or the emission spectrum of adjacent sub-district detectable signal are adjusted synchronously.
The radio node of Microcell is handled and can be comprised adjacent sub-district detectable signal: baseband control unit confirms to receive the geographical position of the radio node of adjacent sub-district detectable signal; According to the barycenter of the radio node of geographical position calculation Microcell, will be with centroid distance less than the radio node of the Microcell of first predetermined value as the node in the adjacent set of cells at terminal; Or the baseband control unit signal strength signal intensity that will receive adjacent sub-district detectable signal greater than the radio node of second predetermined value as the node in the adjacent set of cells at terminal; Or baseband control unit confirms to receive the geographical position of the radio node of adjacent sub-district detectable signal; Barycenter according to the radio node of geographical position calculation Microcell; Will with centroid distance less than first predetermined value, and the signal strength signal intensity of the adjacent sub-district detectable signal that receives greater than the radio node of second predetermined value as the node in the adjacent set of cells at terminal.
The signal strength signal intensity of the adjacent sub-district detectable signal that baseband control unit further receives in the node with adjacent set of cells surpasses the radio node of the 3rd predetermined value as candidate's active node, and in indication information of adjacent cell sign candidate active node.
One of below the relevant information of Microcell can comprise at least: the positional information of the up channel of the initial time information of the frequency point information of Microcell, the radio frames of Microcell, the synchronous channel position information of Microcell, Microcell.
Adjacent sub-district detectable signal can comprise: the lead code that pseudo random sequence makes up, Cyclic Prefix, terminal recognition number.
Indication information of adjacent cell also comprise following one of at least: the signal strength signal intensity of each adjacent sub-district in the adjacent set of cells, signal interference ratio, adjacent cell identification number, the corresponding identifier in terminal.
Identical frequency band can be any one identical sub-band in the radio node working band of Microcell, or a sub-band of the center in the radio node working band of Microcell; Identical time slot can be the ascending time slot in the radio frames that keeps synchronous up access slot or the preset adjacent sub-district of reception detectable signal between the adjacent radio node of Microcell.
Among the said method embodiment, can also comprise: the adjacent sub-district detectable signal of macrocell is sent at the terminal to the radio node of macrocell; The radio node of macrocell receives adjacent sub-district detectable signal respectively in identical frequency band and time slot; And the adjacent sub-district detectable signal of macrocell handled; Generation comprises the indication information of adjacent cell of the adjacent set of cells of terminal macrocell, and the indication information of adjacent cell of macrocell is sent to the terminal.
For realizing above-mentioned purpose, according to another aspect of the present invention, a kind of wireless access network system is provided.
Wireless access network system according to the embodiment of the invention comprises:
First radio node is positioned at macrocell, is used to send the relevant information with synchronous Microcell of macrocell retention time; The terminal is used to obtain the relevant information of the Microcell that first radio node sends, and sends adjacent sub-district detectable signal, and receives the indication information of adjacent cell of the adjacent set of cells that comprises the terminal that network side returns according to adjacent sub-district detectable signal; One or more second radio node lays respectively in one or more Microcells, is used for the adjacent sub-district detectable signal that receiving terminal sends in identical frequency band and time slot; Baseband control unit is used for the adjacent sub-district detectable signal that one or more second radio node receives is handled, and generates the indication information of adjacent cell of the adjacent set of cells that comprises the terminal, and indication information of adjacent cell is sent to the terminal.
First radio node also is used for the adjacent sub-district detectable signal of the macrocell that receiving terminal sends; Baseband control unit is further handled the adjacent sub-district detectable signal of macrocell, generates the indication information of adjacent cell of the adjacent set of cells that comprises the terminal macrocell; The terminal further obtains the indication information of adjacent cell of the adjacent set of cells that comprises macrocell.
The acquisition methods of the adjacent set of cells of various embodiments of the present invention and wireless access network system; Send adjacent sub-district detectable signal (surveying) by the terminal to macrocell or to Microcell; And, be handed down to the terminal by network side by network side completion terminal place Microcell and after comprising the indication information of adjacent cell of adjacent set of cells.Various embodiments of the present invention can effectively be simplified the search procedure of terminal to neighbor cell, shorten the time that the terminal obtains indication information of adjacent cell.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the acquisition methods flow chart according to the indication information of adjacent cell of the embodiment of the invention one;
Fig. 2 is the acquisition methods flow chart according to the indication information of adjacent cell of the embodiment of the invention two;
Fig. 3 forms structural representation according to the wireless access network system of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Method embodiment
Fig. 1 is the acquisition methods flow chart according to the indication information of adjacent cell of the embodiment of the invention one.As shown in Figure 1, present embodiment comprises:
Step S102: terminal from macro is obtained the relevant information with synchronous Microcell of macrocell retention time;
It is one of following that the relevant information of Microcell comprises at least: the frequency of Microcell, the initial moment of the radio frames of Microcell; The synchronous channel position of Microcell, the position of the up channel of Microcell;
The relevant information that terminal from macro is obtained Microcell specifically can receive the relevant information of the Microcell that macrocell sends for: the broadcast channel through macrocell.The moment that terminal from macro is obtained the relevant information of Microcell can be one of following: insert the relevant information of just having accomplished the Cell searching of macrocell and having accepted in the process of macrocell service to read from the broadcast channel of macrocell with mode periodically or under Event triggered Microcell after inserting the broadcast channel of macrocell, at the terminal at the terminal;
Existing cell search process can be adopted to the search procedure of macrocell in the terminal, and can comprise following basic step particularly: time/frequency spectrum is synchronous; Frame synchronization; Cell identification number (Identification is called for short ID) identification.Further,, can adopt the method for the transmission frequency that increases synchronizing channel in order to improve the synchronization acquistion speed of terminal to macrocell, as, in the time of a radio frames, on specific frequency, continue to send synchronizing signal;
Among the step S102; The terminal obtains to keep with macrocell the relevant information of synchronous Microcell on the basis of accomplishing the macrocell search, concrete; The radio frames of the radio frames of macrocell and Microcell on the retention time synchronously; The relevant information of the Microcell that the terminal receives can comprise radio frames frequency and the channel position information of Microcell etc., for subsequent step S104 sends adjacent sub-district detectable signal the transmission condition is provided, and sends detectable signal etc. like the channel position according to Microcell;
Step S104: adjacent sub-district detectable signal is sent according to the relevant information of the Microcell that obtains in the terminal, and adjacent sub-district detectable signal comprises terminal recognition number;
Adjacent sub-district detectable signal can be sent to network side in the terminal on the up channel of Microcell after the relevant information that has obtained Microcell; The up channel of the Microcell that the terminal is used can be the physical uplink RACH, also can be to aim at the adjacent sub-district detectable signal that receiving terminal sends and the channel that designs;
Further; Effect is sent in order to reach adjacent preferably sub-district detectable signal in the terminal; Before network side sends adjacent sub-district detectable signal, can also utilize the synchronizing channel of Microcell that the launch time and/or the emission spectrum at terminal are done synchronous adjustment at step S104 terminal;
Step S106: the radio node of Microcell receives adjacent sub-district detectable signal respectively in identical frequency band and time slot; And adjacent sub-district detectable signal handled; Generation comprises the indication information of adjacent cell of the adjacent set of cells at terminal, and indication information of adjacent cell is sent to the terminal, specifically comprises:
The radio node of Microcell is carried out the baseband control unit of base band control; Confirm the geographical position of Microcell radio node and/or according to the adjacent sub-district signal strength detection that the Microcell radio node is received according to the numbering (identifier) of the Microcell radio node that receives adjacent sub-district detectable signal, confirm to include in the node of the adjacent set of cells at terminal; The identifier of the radio node of the adjacent set of cells of including the terminal in and the terminal recognition in the detectable signal of adjacent sub-district number are generated corresponding relation;
Step S108: the terminal obtains the indication information of adjacent cell that comprises the adjacent set of cells in terminal.
Before the step S108, baseband control unit is sent the indication information of adjacent cell that comprises the adjacent set of cells in terminal through the radio node of macrocell to the terminal; Perhaps the radio node through Microcell sends the indication information of adjacent cell that comprises the adjacent set of cells in terminal to the terminal.
In the present embodiment; Send adjacent sub-district detectable signal (surveying) by the terminal to macrocell or to Microcell; And catch the adjacent sub-district detectable signal that send at the terminal by network side; Accomplish the indication information of adjacent cell that the terminal belongs to Microcell and comprises adjacent set of cells by network side; Wherein, indication information of adjacent cell can comprise the identifier that identification code, the terminal of adjacent set of cells, adjacent cell signal strength, adjacent sub-district is corresponding etc., and is handed down to the terminal by network side (macrocell radio node or Microcell radio node).Present embodiment has been simplified the search procedure of terminal to neighbor cell, has shortened the time that the terminal obtains indication information of adjacent cell.
Fig. 2 is the method flow diagram that obtains indication information of adjacent cell according to the embodiment of the invention two.As shown in Figure 2, present embodiment comprises:
Step S202: terminal from macro is obtained the relevant information with synchronous Microcell of macrocell retention time;
Step S204: adjacent sub-district detectable signal is sent to network in the terminal;
Step S206: whether terminal judges reaches the preset time, otherwise continues execution in step S206, is execution in step S208 then;
Step S208: judging whether to receive the indication information of adjacent cell that comprises the adjacent set of cells in terminal, is then to finish, otherwise execution in step S210;
Step S210: the number of times of the adjacent sub-district of the transmission that judges whether to reach preset detectable signal is then to finish, otherwise continues execution in step S204.
Present embodiment is mainly described from end side; But between step S204～S208; The Microcell radio node of network side is also handled the adjacent sub-district detectable signal that receives; Generation comprises the indication information of adjacent cell of the adjacent set of cells in terminal, and is handed down to the terminal from network side, thereby the terminal judges whether to receive indication information of adjacent cell at step S208.
In the present embodiment; The synchronized relation of radio frames on the retention time of the radio frames of macrocell and Microcell, below in conjunction with the structural representation of the system embodiment of present embodiment and Fig. 3 to embodiment of the invention synchronized relation and obtain that each step is illustrated respectively in the process of indication information of adjacent cell:
Among Fig. 3 embodiment, in the macrocell 301a that radio node 301 is covered, exist several to be used for the radio node (radio node 302～radio node 305) that Microcell (like Fig. 3 Microcell 302a～Microcell 305a) is covered.Wherein, have synchronized relation between the radio frames of the radio frames of radio node 302～radio node 305 and radio node 301, this synchronized relation specifically:
The time of advent (being abbreviated as TOA_mac) of the radio frames of the service macrocell 301a of arrival wireless terminal 307 positions and poor (the Time Difference of Arrival of the time of advent (being abbreviated as TOA_mic) of the Microcell radio frames that arrives wireless terminal 307 positions; Abbreviation TDOA) being one has the fixed value C that error is a Δ, i.e. TDOA=TOA_mac-TOA_mic=C ± Δ.Wherein, the measurement of TOA_mac and TOA_mic can be that the zero-time with radio frames is that reference point is measured, and also can be that the zero-time with certain time slot in the radio frames is that reference point carries out.
In the above-mentioned synchronized relation, error delta is caused by the relative geometry position of wireless terminal 307 with macrocell radio node 301 and Microcell radio node 302～radio node 305; Fixed value C is by network settings, and the span of C is :-10ms～10ms.Network guarantees that the value of error delta is less than OFDM (Orthogonal Frequency DivisionMultiplexing; Be called for short OFDM) Cyclic Prefix (cyclic prefix; Abbreviation CP) time span, the typical span of error delta are-1 μ s＜Δ＜1 μ s (corresponding Microcell radius are 300 meters).
In Fig. 3 embodiment layering wireless access network system; The original position of the radio frames that radio node 302～radio node 305 measurement macrocell radio nodes 301 send arrives the TOA_mac-mic time of advent of this radio node; Then, each Microcell radio node 302～radio node 305 is confirmed the initial moment T_mic of the radio frames of its transmission with reference to TOA_mac-mic.The difference of T_mic and TOA_mac-mic is fixed value C, i.e. T_mic-TOA_mac-mic=C.
Present embodiment step S202 specifically can combine Fig. 3 to understand; As shown in Figure 3; In the layering wireless access network system, wireless terminal 307 is accomplished after the search to macrocell according to the process of time synchronized, frame synchronization, carries out obtaining from macrocell the process of the relevant information of Microcell; And obtain one of following information at least: the frequency of Microcell, the initial moment of the radio frames of Microcell; The primary synchronization channel position of Microcell, the position of the RACH of Microcell.
Among the step S204; The terminal is after obtaining the relevant information of Microcell; Send adjacent sub-district detectable signal (comprise terminal recognition number) to network side, the adjacent sub-district detectable signal that is sent can adopt pseudo noise code sign indicating number coding, and is concrete; Can comprise lead code, Cyclic Prefix that pseudo random sequence makes up, and the identifier of carried terminal (like the ID sign).
In order to realize preferably and the up time synchronized of Microcell radio node that the terminal is before sending adjacent sub-district detectable signal to network side, the primary synchronization channel that can utilize Microcell earlier is to doing further adjustment synchronously the launch time at terminal.
The terminal is sent adjacent sub-district detectable signal at specific frequency band and time slot to Microcell, concrete can in the working band of Microcell and time slot, send detectable signal.The radio node of Microcell can receive the adjacent sub-district detectable signal of self terminal respectively in identical respectively frequency band and identical time slot, like the intensity of coming the measuring adjacent cells detectable signal according to the pseudo random sequence in the detectable signal of adjacent sub-district; Number confirm concrete terminal according to terminal recognition.Identical frequency band can be any one identical sub-band in the radio node working band of Microcell, or a sub-band of the center in the radio node working band of Microcell; Identical time slot can be the ascending time slot in the radio frames that keeps synchronous up access slot or the preset adjacent sub-district of reception detectable signal between the adjacent radio node of Microcell.
The baseband control unit of the radio node of the Microcell of network side is handled the radio node that each receives adjacent sub-district detectable signal, specifically comprises:
Confirm to include in the radio node of the adjacent set of cells at terminal: specifically can be according to the intensity or the energy of the received adjacent sub-district detectable signal of each Microcell radio node; And the geometric distributions of each Microcell radio node; Calculate the barycenter (or energy barycenter) of this group Microcell radio node; Barycenter with this group Microcell radio node is the center of circle, with the distance of barycenter less than the other Microcell radio node (can be the node that does not receive adjacent sub-district detectable signal) of first predetermined value also as the node in the adjacent set of cells of wireless terminal; Can also with the signal strength signal intensity that receives adjacent sub-district detectable signal greater than the radio node of second predetermined value as in the adjacent set of cells at terminal node; Perhaps will with centroid distance less than first predetermined value, and the signal strength signal intensity of the adjacent sub-district detectable signal that receives greater than the radio node of second predetermined value as the node in the adjacent set of cells at terminal.
Further; Baseband control unit is according to received signal strength signal intensity or the signal interference ratio of radio node that receives adjacent sub-district detectable signal; Surpass the candidate active node of the radio node of predetermined threshold value (the 3rd predetermined value) to signal strength signal intensity as the terminal; Candidate's active node is meant that the terminal can set up the node of communication link with it, so that use when initiating to connect at the terminal.
Baseband control unit is behind the adjacent set of cells of confirming the terminal; Issue adjacent set of cells, the identifier of candidate's active node and the terminal recognition number (ID) that is associated with adjacent set of cells that it is confirmed through macrocell radio node or Microcell radio node; The indication information that will comprise adjacent set of cells is mapped with corresponding terminal; Be the corresponding concrete terminal of a certain adjacent set of cells, the terminal can obtain the indication information that comprises adjacent set of cells that macrocell or Microcell issue according to the identifier (ID) of oneself.Those skilled in the art should understand; The adjacent sub-district Indication message that comprises adjacent set of cells can send to the terminal of sending adjacent sub-district probe message by specific frequency band and time slot at the terminal, and therefore, indication information of adjacent cell is the identifier of carried terminal not; But for the accuracy that further guarantees to receive; Present embodiment has added the identifier at terminal, guarantee that the terminal receives indication information of adjacent cell after, can confirm that according to the identifier at terminal this indication information of adjacent cell issues oneself.
Above-mentioned steps is mainly given an example to the indication information that the terminal obtains the adjacent set of cells of Microcell; But those skilled in the art should understand; Further; Search speed for the adjacent macro cell that improves macrocell; The adjacent sub-district detectable signal of macrocell also can be on the up channel of macrocell be sent to network in the terminal, and network side adopts the indication information of adjacent cell of the process identical with the indication information of adjacent cell that obtains Microcell to terminal transmission macrocell, and wherein the indication information of adjacent cell of macrocell comprises the identifier information etc. of candidate's active node of adjacent set of cells information and the macrocell of macrocell.
Present embodiment has also added step S206～step S210; If do not receive indication information of adjacent cell or the confirmation signal that network issues within the time that terminal certain after sending adjacent sub-district detectable signal is preset, then whether terminal judges has reached the number of times that issues adjacent sub-district detectable signal of regulation; If do not reach the number of times of the adjacent sub-district of issuing of regulation detectable signal, then in the adjacent sub-district detection of the transmission of next one regulation time slot, promote transmitting power and return step S204, send adjacent sub-district detectable signal once more; If reach the number of times of the adjacent sub-district of issuing of regulation detectable signal, then finish emission to adjacent sub-district detectable signal, think that there is not available Microcell in this zone.
Among above-mentioned each method embodiment; Accomplish at the terminal on the basis of macrocell search; Utilize the radio frames and the Microcell radio frames synchronized relation in time of macrocell, the frequency and the channel position information of the radio frames of the macrocell radio node of network side on the Microcell radio node of its covering of terminal broadcast; The terminal utilizes the relevant information of the Microcell of receiving on specific frequency and time slot, to send adjacent sub-district detectable signal to network side; Accomplish the ID identification of terminal place Microcell and the Microcell adjacent by network side, comprise judgement the signal strength signal intensity of terminal place Microcell and the Microcell adjacent with this Microcell with this Microcell; And then the radio node through macrocell, perhaps, be handed down to the terminal to place, terminal Microcell, the Microcell adjacent, the signal strength signal intensity or the signal interference ratio of neighbor cell with place, terminal Microcell through the radio node of Microcell.Various embodiments of the present invention can be simplified the search procedure of terminal to the adjacent micro sub-district; Shorten the time that the terminal obtains adjacent set of cells; Because network side can also be handed down to the terminal with candidate's active node information, therefore, can effectively shorten the time that available Microcell is confirmed at the terminal simultaneously.
System embodiment
Fig. 3 forms structural representation according to the wireless access network system of the embodiment of the invention.Present embodiment is the wireless accessing network structure of layering, and is as shown in Figure 3, and present embodiment comprises:
Macrocell layer; Comprise at least one and be used for radio node 301 that macrocell 301a is covered; Radio node 301 is used to send the relevant information with synchronous Microcell of macrocell retention time; Send and receive when can adopt duplexer to realize uplink and downlink in the passage of radio node 301, its radio-frequency channel bandwidth can be 20MHz;
Microcell level comprises 4 and is used for radio node 302～radio node 305 that Microcell 302a～Microcell 305a is covered; Radio node 302～radio node 305 is used for the adjacent sub-district detectable signal that receiving terminal 307 sends in identical frequency band and time slot; Send and receive when can adopt RF switch to realize uplink and downlink in the passage of radio node 302～radio node 305, its radio-frequency channel bandwidth can be 20MHz;
Baseband control unit 306 is used for the radio node 301～radio node 305 in macrocell 301a and the Microcell 302a～Microcell 305a is carried out Base-Band Processing and control; Concrete:
306 pairs of baseband control unit receive and send to the mode that the Base-Band Processing of signal of radio node 302～radio node 305 of radio node 301 and the Microcell of macrocell can adopt frequency domain to handle; And; In the present embodiment baseband control unit 306 can support the synchronous needed measurement of radio frames between macrocell layer and microcell level, to the needed processing of adjacent sub-district detectable signal; Adjacent sub-district detectable signal to radio node 302～radio node 305 receives is handled; Generation comprises the indication information of adjacent cell of the adjacent set of cells at terminal; And indication information of adjacent cell sent to terminal 307 etc., concrete can no longer be repeated in this description referring to related content such as time synchronized, the detectable signal processing of adjacent sub-district among the method embodiment; Communicating by letter between baseband control unit 306 and the radio node (301～305) can be passed through common rf interface (Common Public Radio Interface is called for short CPRI) " Specification V3.0 (2006-10-20) standard " and realized;
Terminal 307; Have with macrocell and Microcell in the ability that communicates of radio node 301～radio node 305; Be used to obtain the relevant information of the Microcell that radio node 301 sends; Send adjacent sub-district detectable signal, and receive the indication information of adjacent cell of the adjacent set of cells that comprises terminal 307 that network side returns according to adjacent sub-district detectable signal.
The adjacent sub-district detectable signal that 306 pairs of radio node 302～radio nodes of baseband control unit 305 receive is handled, and specifically comprises:
Receive the adjacent sub-district detectable signal that each radio node receives, confirm the geographical position of Microcell radio node according to the numbering (identifier) of the Microcell radio node that receives adjacent sub-district detectable signal; Adjacent sub-district signal strength detection and/or geographical position according to the Microcell radio node is received confirm whether this node includes the adjacent set of cells at terminal 307 in; The identifier of the radio node of the adjacent set of cells at terminal 307 and terminal 307 are carried out related, send the indication information of adjacent cell that comprises terminal 307 adjacent set of cells that is associated with terminal 307.
Baseband control unit 306 surpasses the candidate active node of the radio node of predetermined threshold value as the terminal to signal strength signal intensity also according to received signal strength signal intensity or the signal interference ratio of radio node that receives adjacent sub-district detectable signal.Baseband control unit 306 issues the identifier of its adjacent set of cells of confirming, candidate's active node and the terminal recognition that is associated with adjacent set of cells number through macrocell radio node or Microcell radio node after confirming the adjacent set of cells at terminal.
Radio node 301 also is used for the adjacent sub-district detectable signal of the macrocell that receiving terminal 307 sends; Baseband control unit 306 is further handled the adjacent sub-district detectable signal of macrocell, generates the indication information of adjacent cell of the adjacent set of cells that comprises the terminal macrocell; Terminal 307 further obtains the indication information of adjacent cell of the adjacent set of cells that comprises macrocell.
In the wireless access network system of present embodiment layering, terminal 307 is a wireless terminal, can after obtaining the relevant information of Microcell from macrocell, on the working band of Microcell, send adjacent sub-district detectable signal to network side; One group of adjacent Microcell radio node (as: radio node 302～radio node 305) can receive the adjacent sub-district detectable signal from wireless terminal 307 respectively in identical frequency band and identical time slot.
Wireless terminal 307 comprises to the adjacent sub-district detectable signal that network sends: the lead code that pseudo random sequence makes up, and Cyclic Prefix, the identifier at terminal (ID), adjacent sub-district detectable signal can adopt identical with accidental access signal or similar methods is carried out.
In the present embodiment; Adjacent Microcell radio node 302～radio node 305 receives the adjacent sub-district detectable signal from wireless terminal 307 respectively in identical frequency band and identical time slot; Wherein, identical frequency band can be: the unified sub-band that any one in Microcell radio node 302～radio node 305 working bands is predetermined; Identical frequency band implementation method preferably is: the sub-frequency bands that selection is positioned at the center of Microcell radio node working band receives the adjacent sub-district detectable signal from wireless terminal 307.
Identical time slot can be: the up access slot of the radio node that radio node 302～radio node 305 maintenances in adjacent micro sub-district are synchronous, or special in receiving certain ascending time slot in the determined radio frames of adjacent sub-district detectable signal.
Microcell radio node 302～radio node 305 is measured the TOA_mac-mic in the above-mentioned synchronized relation on the synchronizing channel that macrocell radio node 301 sends in the present embodiment; The cell search process of measuring process and wireless terminal similar, no longer explanation.
Further, easy in order to realize, can realize measurement through the corresponding synchronous receiving system (like receiver etc.) that keeps is installed on Microcell radio node 302～radio node 305 to TOA_mac-mic.
After A representes that the macrocell search is accomplished at terminal 307 in the present embodiment; Macrocell issues the relevant information of Microcell; After B representes that the relevant information of Microcell is received at terminal 307, send adjacent sub-district detectable signal to Microcell, C representes the adjacent sub-district detectable signal that send at network based terminal 307; Obtain indication information of adjacent cell, and be handed down to terminal 307 through macrocell.Thus, can find out that the search of macrocell only need be accomplished in the terminal in the present embodiment,, obtain the indication information of adjacent cell that comprises adjacent set of cells that issues by network side at last, can effectively save the time of the 307 pairs of adjacent micro Cell searchings in terminal through sending detectable signal.
In sum, various embodiments of the present invention are sent adjacent sub-district detectable signal (surveying to macrocell or to Microcell) by the terminal, and by network side completion terminal place Microcell and after comprising the indication information of adjacent cell of adjacent set of cells, are handed down to the terminal by network side.Various embodiments of the present invention can effectively be simplified the search procedure of terminal to neighbor cell, shorten the time that the terminal obtains indication information of adjacent cell, reduce the power consumption that the terminal obtains adjacent set of cells.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the acquisition methods of an indication information of adjacent cell is applied to comprise the layering wireless access network of several Microcells in macrocell and the macrocell, it is characterized in that said method comprises:
Terminal from macro is obtained the relevant information with synchronous Microcell of said macrocell retention time;
Adjacent sub-district detectable signal is sent according to the relevant information of the said Microcell that obtains in said terminal;
The radio node of said Microcell receives said adjacent sub-district detectable signal respectively in identical frequency band and time slot; And said adjacent sub-district detectable signal handled; Generation comprises the indication information of adjacent cell of the adjacent set of cells at said terminal, and said indication information of adjacent cell is sent to said terminal;
Said terminal obtains said indication information of adjacent cell.
2. method according to claim 1 is characterized in that, the operation that said terminal from macro is obtained with the relevant information of synchronous Microcell of said macrocell retention time is specially:
The Cell searching to macrocell is accomplished at said terminal, inserts after the broadcast channel of said macrocell, obtains the relevant information of said Microcell from the broadcast channel of said macrocell; Perhaps
Said terminal obtains the relevant information of said Microcell periodically or under trigger event triggering from the broadcast channel of said macrocell in the process that receives the macrocell service.
3. method according to claim 1 is characterized in that, send before the detectable signal of said adjacent sub-district at said terminal, also comprises:
Said terminal uses the synchronizing channel of said Microcell that the launch time and/or the emission spectrum of said adjacent sub-district detectable signal are adjusted synchronously.
4. method according to claim 1 is characterized in that, the operation that the radio node of said Microcell is handled said adjacent sub-district detectable signal comprises:
Baseband control unit confirms to receive the geographical position of the radio node of said adjacent sub-district detectable signal; Calculate the barycenter of the radio node of said Microcell according to said geographical position, will be with said centroid distance less than the radio node of the Microcell of first predetermined value as the node in the adjacent set of cells at said terminal; Or
The signal strength signal intensity that said baseband control unit will receive said adjacent sub-district detectable signal greater than the radio node of second predetermined value as in the adjacent set of cells at said terminal node; Or
Said baseband control unit confirms to receive the geographical position of the radio node of said adjacent sub-district detectable signal; Calculate the barycenter of the radio node of said Microcell according to said geographical position; Will with said centroid distance less than said first predetermined value, and the signal strength signal intensity of the said adjacent sub-district detectable signal that receives greater than the radio node of said second predetermined value as the node in the adjacent set of cells at said terminal.
5. method according to claim 4 is characterized in that, also comprises:
The signal strength signal intensity of the said adjacent sub-district detectable signal that receives in the node of said baseband control unit with said adjacent set of cells surpasses the radio node of the 3rd predetermined value as candidate's active node, and in said indication information of adjacent cell, identifies said candidate's active node.
6. according to each described method in the claim 1 to 5; One of it is characterized in that, below the relevant information of said Microcell comprises at least: the positional information of the up channel of the initial time information of the frequency point information of Microcell, the radio frames of Microcell, the synchronous channel position information of Microcell, Microcell.
7. according to each described method in the claim 1 to 5, it is characterized in that said adjacent sub-district detectable signal comprises: the lead code that pseudo random sequence makes up, Cyclic Prefix, terminal recognition number.
8. according to each described method in the claim 1 to 5, it is characterized in that, said indication information of adjacent cell also comprise following one of at least:
The signal strength signal intensity of each adjacent sub-district in the said adjacent set of cells, adjacent cell identification number, the corresponding identifier in said terminal.
9. according to each described method in the claim 1 to 5, it is characterized in that:
Any same sub-band in the radio node working band that said identical frequency band is said Microcell, or a sub-band of the center in the radio node working band of said Microcell;
Keep the ascending time slot in the radio frames of synchronous up access slot or the preset said adjacent sub-district of reception detectable signal between the adjacent radio node that said identical time slot is said Microcell.
10. according to each described method in the claim 1 to 5, it is characterized in that, further comprise:
The adjacent sub-district detectable signal of macrocell is sent at said terminal to the radio node of said macrocell;
The radio node of said macrocell receives the adjacent sub-district detectable signal of said macrocell respectively in identical frequency band and time slot; And the adjacent sub-district detectable signal of said macrocell handled; Generation comprises the indication information of adjacent cell of the adjacent set of cells of said terminal macrocell, and the indication information of adjacent cell of said macrocell is sent to said terminal.
11. a wireless access network system is characterized in that, comprising:
First radio node is positioned at macrocell, is used to send the relevant information with synchronous Microcell of said macrocell retention time;
The terminal is used to obtain the relevant information of the said Microcell that said first radio node sends, and sends adjacent sub-district detectable signal, and receives the indication information of adjacent cell of the adjacent set of cells that comprises said terminal that network side returns according to said adjacent sub-district detectable signal;
One or more second radio node lays respectively in one or more Microcells, is used in identical frequency band and time slot, receiving the said adjacent sub-district detectable signal that send at said terminal;
Baseband control unit is used for the said adjacent sub-district detectable signal that said one or more second radio node receives is handled, and generates the indication information of adjacent cell of the adjacent set of cells that comprises said terminal, and said indication information of adjacent cell is sent to said terminal.
12. system according to claim 11 is characterized in that, said first radio node also is used to receive the adjacent sub-district detectable signal of the said macrocell that sends at said terminal; Said baseband control unit is further handled the adjacent sub-district detectable signal of said macrocell, generates the indication information of adjacent cell of the adjacent set of cells that comprises said terminal macrocell; Said terminal further obtains the indication information of adjacent cell of the adjacent set of cells that comprises macrocell.
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| CN102036295B (en) * | 2010-12-02 | 2014-04-16 | 大唐移动通信设备有限公司 | Method, system and equipment for determining uplink and downlink configuration |
| CN102318410B (en) * | 2011-08-03 | 2013-12-04 | 华为技术有限公司 | Subdistrict searching method and device |
| CN104429111B (en) * | 2012-07-20 | 2019-02-19 | 华为技术有限公司 | Network system with local cluster, central controller, micro-base station and macro base station |
| US8798633B2 (en) * | 2012-08-22 | 2014-08-05 | Intel Corporation | Positioning-assisted cell selection and handover for LTE |
| GB2512611A (en) * | 2013-04-03 | 2014-10-08 | Sharp Kk | Wireless telecommunication cell detection technique |
| CN104812054B (en) | 2014-01-27 | 2019-09-17 | 中兴通讯股份有限公司 | A kind of delay inequality determines method, system, base station and user equipment |
| CN109041105B (en) | 2017-06-09 | 2020-10-16 | 维沃移动通信有限公司 | Sending method of adjacent cell information, and processing method and device of adjacent cell information |
| CN110035491B (en) * | 2018-01-11 | 2020-06-19 | 维沃移动通信有限公司 | Synchronization indication method and device |
| GB2577514B (en) * | 2018-09-26 | 2023-03-29 | Tcl Communication Ltd | Inter-RAT selection |
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| WO2006083134A1 (en) * | 2005-02-05 | 2006-08-10 | Lg Electronics Inc. | Method of executing handoff of mobile terminal in mobile communications system |
| CN101103547A (en) * | 2005-01-14 | 2008-01-09 | 汤姆森特许公司 | Cell search using Rake searcher to perform scrambling code determination |
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| CN101103547A (en) * | 2005-01-14 | 2008-01-09 | 汤姆森特许公司 | Cell search using Rake searcher to perform scrambling code determination |
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