CN100484328C - Method for connecting channel to user's terminal and base station node - Google Patents
Method for connecting channel to user's terminal and base station node Download PDFInfo
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- CN100484328C CN100484328C CNB2006101010044A CN200610101004A CN100484328C CN 100484328 C CN100484328 C CN 100484328C CN B2006101010044 A CNB2006101010044 A CN B2006101010044A CN 200610101004 A CN200610101004 A CN 200610101004A CN 100484328 C CN100484328 C CN 100484328C
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Abstract
The invention is used to improve the access performance as well as ensuring equity access of UEs. In the invention, the equity strategy and energy size of user end are used to select user ends to access channel; in the selected user ends, at least there is one user end having the maximal energy size, and at least there is one user end that is selected based on equity principle. In the first, according to the equity strategy, M UEs can be selected from UEs requesting access, and then N UEs can be selected from other residual UEs according to maximal energy strategy; the sum of M and N is the number of UEs capable of being processed in one time slot.
Description
Technical field
The present invention relates to moving communicating field, particularly the technology of connecting channel to user's terminal.
Background technology
3-G (Generation Three mobile communication system) Wideband Code Division Multiple Access (WCDMA) (Wideband Code Division MultipleAccess, be called for short " WCDMA ") system owing to its strong multimedia communication capacity, high-speed data transmission speed and efficiently many advantages such as the availability of frequency spectrum gain great popularity, and become the developing goal of future mobile communications.
The channel of WCDMA can be divided into dedicated channel and common channel two big classes.Wherein, dedicated channel comprises: Traffic Channel, Separate Dedicated Control Channel, follow Dedicated Control Channel.Common channel comprises: Broadcast Control Channel, forward access channel, paging channel, Random Access Channel.These channels are mapped to corresponding physical channel by different modes, i.e. DPCH and public physical channel.And public physical channel is divided into descending public physical channel and up public physical channel.
In addition, the working method of WCDMA system is also divided two kinds, comprises Frequency Division Duplexing (FDD) (FrequencyDivision Duplex is called for short " FDD ") and time division duplex (Time Division Duplex is called for short " TDD ").
Wherein, the up public physical channel of WCDMA system under the FDD working method is Physical Random Access Channel (Physical Random Access Channel is called for short " PRACH ").Subscriber equipment (User Equipment is called for short " UE ") inserts the WCDMA system at random by the PRACH channel, communicates with base-station node (Base Station is called for short " Node B "), obtains the business that the WCDMA system provides.
On the PRACH channel, the random access procedure that carries out between user and the Node B is to have the access way at random (time slot A LOHA) of the time slotization of quick access indication to realize with a kind of.It comprises targeting signal (Preamble) and message signale (Message) two parts.Wherein, targeting signal be by 16 complex symbols (1+j or-1-j, j is the mark of imaginary part) characteristic sequence (Signature) formed, have 16 kinds of different sequences.Theoretically, each PRACH channel allows 16 users at each access slot and inserts, and different PRACH channels is distinguished with spreading code.
In random access procedure, the user sends targeting signal as inserting request by up PRACH channel, and Node B judges according to judgment criterion behind the targeting signal that detects on the PRACH channel whether decision allows this user to insert.
Node B judges whether that the judgment criterion that allows to insert has three usually, is respectively: multi-path threshold, guide and support thresholding and insert thresholding.
Wherein, multi-path threshold is the characteristic according to radio wave transmissions, the decision threshold of the multipath signal that selection RAKE reception technique receives.Specifically, because transmitting of user has many approach during actual arrival Node B, Node B side need adopt the RAKE reception technique, and multipath signal is carried out the rake reception, is weighted adjustment respectively, makes it to be combined into the signal of reinforcement.The decision threshold of multipath signal is set at this situation (multipath effect).
Guiding and supporting thresholding is the decision threshold that adopts usually when the multipath signal number is counted less than the maximum receiving multipath signals of RAKE reception technique, is used for improving the receptivity of RAKE reception technique, also promptly is used to select to participate in the footpath of guiding and supporting of RAKE reception technique reception.
Inserting thresholding then is according to all energy situation and noise situations greater than the multipath signal of multi-path threshold, and the decision threshold that inserts of the access-in resource situation of system.
Node B according to multi-path threshold, guide and support thresholding, insert thresholding user's targeting signal is judged after, by descending acquisition indicator channel (Acquisition Indicator Channel, be called for short " AICH "), return acquisition indicator (Acquisition Indicator to the user, be called for short " AI ") information, whether indication Node B allows this user to insert.
Because in theory, each PRACH channel can have 16 users to insert at each access slot, yet in actual applications because resource limit, Node B can not be supported in generally in 1 time slot simultaneously that the characteristic sequence to 16 preface informations carries out demodulation, to judge whether to allow its access.Therefore, Node B need be according to certain strategy, and the user that request is inserted carries out the selectivity judgement.
In the prior art, Node B adopts in the characteristic sequence order of each time slot according to the targeting signal that is received, and inserts thresholding in conjunction with it, and the characteristic sequence of targeting signal is carried out the judgement of permanent order, finishes the judgement that different user is inserted.Yet, make that characteristic sequence is that always to be higher than characteristic sequence be 15 UE in proper order for the priority of 0 UE in proper order because Node B fixes in proper order to the judgement of feature sequence number.For UE, its characteristic sequence more early obtains judging, just more early receives the feedback information of Node B, thereby can preferentially insert.The inquiry of permanent order makes the more preceding UE of characteristic sequence order always have precedence over all the other users and inserts, thereby makes network side can't realize fair the access.
Except characteristic sequence being carried out the judgement of permanent order, Node B can also adopt the method for tabling look-up, the order that is about to characteristic sequence is put into form, by the order of once tabling look-up in each time slot conversion, change the judgement order of each characteristic sequence, in conjunction with inserting thresholding, finish the judgement that different user is inserted again, make different order the feature sequence number can accept preferential judgement in turn.Guaranteed the fair access of network side.Yet this determination methods had both needed to adopt look-up table, need table look-up in proper order in each time slot conversion again, and the management more complicated, and resource overhead is bigger.
In addition, Node B can also in conjunction with inserting thresholding, finish the judgement that different user is inserted at different time-gap, according to the characteristic sequence order of going forward one by one.Be Node B when first time slot, with the order of characteristic sequence 0 to 15, carry out the access of each characteristic sequence and judge, when second time slot, carry out the access of characteristic sequence with the order of characteristic sequence 1 to 15 to 0 and judge, by that analogy.Thereby when simplifying the operation, guaranteed the fairness that inserts.
Yet, adopt this method, go into than under the serious situation in virtual connection, the phenomenon that the user that may cause actual request to insert is difficult to insert, make reception broadband gross power (the Received Total Wideband Power that Node B receives simultaneously, be called for short " RTWP ") soaring, influence other user.
Its reason is, because the resource-constrained of PRACH channel process user access simultaneously, when being provided with of decision threshold is on the low side, may produce a large amount of virtual connections and go into, in the case, merely carry out the user and insert judgement according to the order of each time slot correspondence, the user that may cause actual request to insert can't insert, force these users to promote the transmitting power of preface information, request inserts once more, has strengthened the degree of difficulty that real user inserts.The gross power RTWP that causes Node B to receive simultaneously is soaring, has increased the interference to other subscriber signal.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and base-station node of connecting channel to user's terminal, makes network side improve the access performance of system in the fair access of guaranteeing UE.
For achieving the above object, the invention provides a kind of method of connecting channel to user's terminal, comprise following steps:
The connecting channel to user's terminal that network side selects request to insert according to the energy size of fairness policy and user terminal, the energy that has a user terminal in the selected user terminal at least is maximum in the user terminal that inserts of each described request, and has at least a user terminal to select with fairness policy.
Wherein, described network side sets in advance the user terminal of selecting according to described fairness policy and counts M and count N according to the user terminal that described energy size is selected;
The user terminal that described network side selects described request to insert in the following manner:
Described network side is selected M according to described fairness policy earlier from the user terminal that request inserts, select N user terminal of energy maximum again in the user terminal that remaining other request inserts.
In this external described method, described network side sets in advance to be selected user terminal according to described fairness policy and counts M and count N according to the user terminal that described energy size is selected;
The user terminal that described network side selects described request to insert in the following manner:
Described network side is selected N of energy maximum earlier from the user terminal that request inserts, select M user terminal according to described fairness policy again in the user terminal that remaining other request inserts.
In this external described method, described fairness policy is a connecting channel to user's terminal of selecting request to insert with random fashion.
In this external described method, described fairness policy is the user terminal that inserts according to different characteristic sequence selective sequential requests at different time-gap.
In this external described method, the selected user terminal of described network side adds up to the user terminal number that the demodulation resource of this network side can be handled in a time slot.
In this external described method, described channel is a Physical Random Access Channel.
The present invention also provides a kind of base-station node, comprises:
Select module, be used for selecting the connecting channel to user's terminal of request access according to the energy size of fairness policy and user terminal, the energy that has a user terminal in the selected user terminal at least is maximum in the user terminal that inserts of each described request, and has at least a user terminal to select with fairness policy.
Wherein, described base-station node also comprises the preservation module is set, and is used to preserve the user terminal of selecting according to described fairness policy that sets in advance and counts M and count N according to the user terminal that described energy size is selected;
The user terminal that described selection module selects described request to insert in the following manner:
Described selection module is individual according to described fairness policy selection M from the user terminal that request inserts earlier, selects the N of energy maximum individual in the user terminal that remaining other request inserts again.
In addition, described base-station node also comprises the preservation module is set, and is used to preserve the user terminal of selecting according to described fairness policy that sets in advance and counts M and count N according to the user terminal that described energy size is selected;
The user terminal that described selection module selects described request to insert in the following manner:
Described selection module is selected N of energy maximum earlier from the user terminal that request inserts, select M user terminal according to described fairness policy again in the user terminal that remaining other request inserts.
By relatively finding, the main distinction of technical scheme of the present invention and prior art is, select the connecting channel to user's terminal of request access according to the energy size of fairness policy and user terminal, have the energy maximum of a user terminal in the selected user terminal at least, and have at least a user terminal to select with fairness policy.Both guaranteed the fair access of UE; Guaranteed that also the bigger UE of energy also can be access in, avoided when system resource is not enough, constantly soaring access power trial does not insert the UE that energy is bigger owing to be access in, the RTWP that causes base-station node to receive is soaring, and then badly influence the problem that system inserts success rate, improved the access performance of system.
The present invention proposes two kinds of specific embodiments: a kind of mode is for selecting M UE according to fairness policy earlier from the UE that request inserts, in the UE that remaining other request inserts, select N UE of energy maximum again, M and N's and the UE number that in a time slot, can handle for the demodulation resource of network side; Another kind of mode is to select N UE of energy maximum earlier from the UE that request inserts, and selects M UE according to fairness policy again in the UE that remaining other request inserts.Before a kind of mode under the prerequisite that guarantees to have M UE to obtain being impartial to, to greatest extent other demodulation resource has been distributed to the bigger UE of energy, many scenes are gone in relatively more suitable virtual connection.A kind of mode in back has been distributed to the UE that each request inserts with other demodulation resource by fairness policy to greatest extent under the prerequisite that N the UE that guarantees the energy maximum is access in, the fairness aspect is done better
Wherein, fairness policy can have multiple, for example is that this mode can guarantee the fair access of UE with fewer resource in the random fashion of different time-gap according to the UE of different characteristic sequence selective sequential request accesses.
Description of drawings
Fig. 1 is the method flow diagram according to the UE access channel of first embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Core of the present invention is that Node B is under the situation of the resource-constrained that can provide, according to two aspects of energy size of fairness policy and UE, the UE access channel that divides two parts to select request to insert.Make the timely access channel of one or more UE of energy maximum, avoid it that NodeB or other UE are had a negative impact, and under the prerequisite that guarantees system stability, select remaining UE access channel, make most UE to be treated liberally with fairness policy.
By selecting the UE access channel according to fairness and ability size two aspects, on original basis, improved the stability of systematic function, efficiently solve UE when causing transmitting power too high because of following problem, the RTWP that the NodeB that may cause receives rises, influences the problem of other UE.
May cause the too high reason of UE transmitting power to have:
1, the access thresholding is unreasonable, the virtual connection of system is gone into too high, though make indivedual UE initiate access, but system is based on different time-gap, insert when judgement by the different characteristic numeric order, and resource is distributed on virtual connection goes into too much, causes the system resource deficiency, thereby make this UE to insert, force the soaring always access power of this UE to attempt inserting, and then the RTWP that causes NodeB to receive is soaring, finally influences whole system.
2, the access channel open loop power is inaccurate, and it is big that the power in the time of also may causing UE to insert becomes.Because the targeting signal that request inserts adopts 256 repetitions based on 16 chip lengths condition codes of feature sequence number, the incomplete quadrature of this condition code, when the access energy of a certain feature sequence number is very big, can cause NodeB to search the correlation energy of further feature sequence number, cause virtual connection to go into, and then causing the transmitting power of UE to increase indirectly, the RTWP that causes NodeB to receive is soaring, finally influences whole system.
3, the UE that inserts in request is too much, and under the system resource condition of limited, for the UE that can not the insert access power that also can rise always, constantly attempts inserting once more, and the RTWP that causes NodeB to receive rises, and finally influences whole system.
Describe according to the method for inventive principle below first embodiment of the invention UE access channel.
In the present embodiment, the channel that the UE request inserts is PRACH, and the UE that network side selects request to insert according to the energy size of fairness policy and UE inserts PRACH.Network side sets in advance that the UE that selects according to fairness policy counts M and the UE that selects according to the energy size counts N.Wherein, UE counts the UE sum that M and N sum can be handled in a time slot for the demodulation resource of this network side.
Idiographic flow as shown in Figure 1, in step 110, whether network side at first can insert PRACH according to inserting the UE that each request inserts in the threshold judgement current time slots, promptly whether satisfies the condition that inserts PRACH.Concrete decision method is same as the prior art, does not repeat them here.
Then enter step 120, network side judges whether the UE number satisfy the PRACH access conditions surpasses the UE sum that the demodulation resource of network side can be handled in a time slot.If surpass then enter step 130, request is inserted and the UE that satisfies access conditions inserts PRACH; Otherwise, then enter step 140.
In step 140, network side selects M UE to insert PRACH from all UE that satisfy access conditions earlier according to fairness policy.Wherein, fairness policy can be a UE access channel of selecting request to insert with random fashion.Such as network side produces random number respectively for the UE that each satisfies access conditions, selects M bigger UE to insert PRACH according to the size of its random number corresponding.In addition, fairness policy can also be the UE access channel that inserts according to different characteristic sequence selective sequential requests at different time-gap.Such as network side forms a matrix in proper order with the characteristic sequence of different time-gap institute reference, and in the characteristic sequence order of different time-gap according to the different rows in the matrix, in satisfying the UE of access conditions, M UE inserts PRACH before selecting.As satisfy M UE of access conditions according to the selective sequential of first row of matrix at first time slot, at second time slot, satisfy M UE of access conditions according to the selective sequential of matrix second row, ..., successively each time slot in turn according to matrix in different row, according to different characteristic sequence orders, select to insert the UE of PRACH.By following matrix as seen, for each row, between the characteristic sequence a and b of any two UE, the line number that a appears at the b left side (being that a is before b) has 8 row, the line number that b appears at a left side (being that b is before a) has 8 row, thereby has embodied the fairness that each UE inserts.And the method that adopts this selection UE can guarantee the fair access of UE with less resource.
Then enter step 150, network side then in the remaining UE that satisfies access conditions by energy selective sequential N from big to small UE access PRACH.Thereby both guaranteed the fair access of UE, also make the bigger UE of energy in time to be access in, avoided when system resource is not enough, constantly soaring access power trial does not insert the UE that energy is bigger owing to be access in, the RTWP that causes base-station node to receive is soaring, and then badly influence the problem that system inserts success rate, improved the access performance of system.
The method of second embodiment of the invention UE access channel and first execution mode are roughly the same, its difference only is, in the first embodiment, network side at first selects M UE to insert PRACH from all UE that satisfy access conditions according to fairness policy, from remaining UE, select the UE of N energy maximum to insert PRACH according to the energy of UE more afterwards, thereby under the prerequisite that guarantees to have M UE to obtain being impartial to, to greatest extent other demodulation resource has been distributed to the bigger UE of energy, relatively be fit to virtual connection and go into many scenes; And in the present embodiment, network side is at first according to the energy of UE, select N UE that satisfies access conditions of energy maximum to insert PRACH, afterwards, in remaining UE, select M UE to insert PRACH again according to fairness policy, thereby under the prerequisite that N the UE that guarantees the energy maximum is access in, to greatest extent other demodulation resource is distributed to the UE that each request inserts by fairness policy, strengthened the fairness that channel inserts.
In the third embodiment of the invention, Node B has increased the selection module and the preservation module has been set on the basic module basis of prior art.Wherein, select module to be used for the UE access channel of selecting request to insert according to the energy size of fairness policy and UE, be provided with and preserve module and be used to preserve that the UE that selects according to fairness policy that sets in advance counts M and the UE that selects according to the energy size counts N.
Specifically, Node B is when the UE sum that request inserts and the UE sum that satisfies access conditions (obtaining according to inserting threshold judgement) can be handled in a time slot greater than the demodulation resource of this Node B, by selecting module from the UE that satisfies access conditions, to select M UE to insert PRACH, insert and satisfy N UE access PRACH of selection energy maximum among the UE of access conditions again in remaining other request according to fairness policy.Thereby when guaranteeing the fair access of UE as far as possible, also make the bigger UE of energy to be access in, avoided when system resource is not enough, constantly soaring access power trial does not insert the UE that energy is bigger owing to be access in, the RTWP that causes base-station node to receive is soaring, and then badly influence the problem that system inserts success rate, improved the access performance of system.Wherein, the UE that selects according to fairness policy count M and according to the UE that the energy size is selected count N by the system manager set in advance Node B the preservation module is set, selective module is used.
In addition, in the present embodiment, select module also can be earlier to insert and satisfy the UE of access conditions and select N UE of energy maximum to insert PRACH, in remaining UE, select M UE access PRACH again according to fairness policy from request.This selection mode has been distributed to the UE that each request inserts with other demodulation resource by fairness policy to greatest extent under the prerequisite that N the UE that guarantees the energy maximum is access in, the fairness aspect is done better.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (10)
1. the method for a connecting channel to user's terminal is characterized in that, comprises following steps:
The connecting channel to user's terminal that network side selects request to insert according to the energy size of fairness policy and user terminal, the energy that has a user terminal in the selected user terminal at least is maximum in the user terminal that inserts of each described request, and has at least a user terminal to select with fairness policy.
2. the method for connecting channel to user's terminal according to claim 1 is characterized in that, described network side sets in advance the user terminal of selecting according to described fairness policy and counts M and count N according to the user terminal that described energy size is selected;
The user terminal that described network side selects described request to insert in the following manner:
Described network side is selected M according to described fairness policy earlier from the user terminal that request inserts, press N user terminal of energy selective sequential energy maximum from big to small again in the user terminal that remaining other request inserts.
3. the method for connecting channel to user's terminal according to claim 1 is characterized in that, described network side sets in advance to be selected user terminal according to described fairness policy and count M and count N according to the user terminal that described energy size is selected;
The user terminal that described network side selects described request to insert in the following manner:
Described network side is pressed N of energy selective sequential energy maximum from big to small earlier from the user terminal that request inserts, select M user terminal according to described fairness policy again in the user terminal that remaining other request inserts.
4. according to the method for each described connecting channel to user's terminal in the claim 1 to 3, it is characterized in that described fairness policy is a connecting channel to user's terminal of selecting request to insert with random fashion.
5. according to the method for each described connecting channel to user's terminal in the claim 1 to 3, it is characterized in that described fairness policy is the user terminal that inserts according to different characteristic sequence selective sequential requests at different time-gap.
6. the method for connecting channel to user's terminal according to claim 5 is characterized in that, the selected user terminal of described network side adds up to the user terminal number that the demodulation resource of this network side can be handled in a time slot.
7. the method for connecting channel to user's terminal according to claim 6 is characterized in that, described channel is a Physical Random Access Channel.
8. a base-station node is characterized in that, comprises:
Select module, be used for selecting the connecting channel to user's terminal of request access according to the energy size of fairness policy and user terminal, the energy that has a user terminal in the selected user terminal at least is maximum in the user terminal that inserts of each described request, and has at least a user terminal to select with fairness policy.
9. base-station node according to claim 8, it is characterized in that, described base-station node also comprises the preservation module is set, and is used to preserve the user terminal of selecting according to described fairness policy that sets in advance and counts M and count N according to the user terminal that described energy size is selected;
The user terminal that described selection module selects described request to insert in the following manner:
Described selection module is selected M according to described fairness policy earlier from the user terminal of request access, the N that presses energy selective sequential energy maximum from big to small again in the user terminal that remaining other request inserts is individual.
10. base-station node according to claim 8, it is characterized in that, described base-station node also comprises the preservation module is set, and is used to preserve the user terminal of selecting according to described fairness policy that sets in advance and counts M and count N according to the user terminal that described energy size is selected;
The user terminal that described selection module selects described request to insert in the following manner:
Described selection module is pressed N of energy selective sequential energy maximum from big to small earlier from the user terminal that request inserts, select M user terminal according to described fairness policy again in the user terminal that remaining other request inserts.
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| CN103052134B (en) * | 2012-12-26 | 2015-02-04 | 北京邮电大学 | Renewable energy supply base station access selection method and system |
| CN103490964B (en) * | 2013-09-18 | 2017-03-15 | 杭州华三通信技术有限公司 | A kind of method and device for realizing that flexible configuration terminal accesses quantity |
| CN107333283B (en) * | 2017-06-06 | 2020-02-18 | 京信通信系统（中国）有限公司 | Random access detection method and device |
| EP4030858A1 (en) * | 2018-06-20 | 2022-07-20 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Channel access method and apparatus for physical random access channel transmission |
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