CN103249006A - Multicast-based network data pre-pushing method - Google Patents
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Abstract
The invention discloses a multicast-based network data pre-pushing method, and belongs to the technical field of wireless network data transmission. In wireless network data transmission, when a user requests network data, according to task request analysis and current network channel states, a base station determines whether the task is pre-pushed in a multicast manner to users with similar internet use habits and within the coverage area of the base station or in neighboring cells; according to a prior probability function of user's internet use habits accumulated previously and channel states of active users, an alternative user scheme, a multi-cell coordinated transmission scheme and a modulation coding scheme that all participate in multicast pre-pushing are calculated; expected revenue which can be obtained by adopting the multicast manner is calculated; and compared with a conventional unicast manner, if the multicast manner obtains the revenue greater than a set threshold value, the multicast-based network data pre-pushing method is adopted for pushing, otherwise, a conventional method is adopted for pushing. The multicast-based network data pre-pushing method can effectively improve the wireless spectrum efficiency and the energy efficiency, and optimizes the transmission performance of the network on the whole.
Description
Technical field
The present invention relates to the pre-method for pushing of a kind of network data based on multicast, belong to the wireless network data transmission technique field.
Background technology
Along with smart mobile phone, the increase of hand-held mobile terminal number, the future mobile communications network traffic data will increase substantially, and wherein the data traffic of the overwhelming majority will come from that web browses and Internet video class business.For under limited physical resource, satisfy the business demand of rapid growth, following mobile radio system must have higher transmission rate, the higher availability of frequency spectrum, lower energy consumption.
In the transmission of traditional wireless data, there have the terminal of Network demand to obtain the general flow of service to be as follows:
1. terminal reads network system information and random access resource
2. terminal inserts at random, and initiates again when access contention is failed at random
3. connect with network base station
4. network based present load and adjacent area interference situation are carried out allocation of radio resources
5. terminal is carried out the up-downgoing transfer of data with network
6. terminal discharges with network and connects, and finishes the transmission of business datum
Analyze demonstration according to statistics, different user has certain correlation for the demand of Network, and the Internet resources of some focus may be required by different user.This correlation is the content of business together, the behavioural characteristic of user's online, and the time of asset creation, attributes such as user locations distribution all have certain contact.In traditional Network transfer process, do not consider the correlation of network service, different users asks and need set up network connection separately according to above-mentioned steps respectively, independently carry out professional transmission, therefore the business that has identical content, may repeatedly be repeated transmission, be caused the waste of physical resource.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the objective of the invention is to propose the pre-method for pushing of a kind of network data based on multicast, can utilize the Correlation properties of Network, according to before the accumulation the user to the prior probability function of network use habit and active user's channel status, take full advantage of physical resource, improve efficiency of transmission, reduce power consumption.
For achieving the above object, the present invention takes following technical scheme:
The pre-method for pushing of a kind of network data based on multicast, the user behavior data of terminal in network side accumulates its covering, when a certain user terminal requests network data, network side is according to the business tine of this accumulation data and this time request, if judge all the other terminals in covering for the demand probability of this business tine greater than predefined value, then use the pre-propelling data of mode of multicast, when sending data to the active user, finish a plurality of terminal business demand in future.
When a user terminal requests network data, earlier according to the pre-propelling data buffer memory of content search of asking, whether seek in that certain has received data content of request this time by the mode of pre-propelling movement constantly before, if do not receive, perhaps new data need be upgraded and receive to this terminal, this user terminal generates upstream data, the information of service request of oneself is put into upstream message, and adhere to the Flag marker bit whether a sign needs to receive new data; After user terminal is set up link with network side, send request msg, network side detects request content, user terminal ID utilizes more new business temperature database of request content, upgrades the user behavior data storehouse according to user behavior, detect the Flag marker bit, if this user terminal does not need the data that please look for novelty, then conversation end this time disconnects network connection; If when this user terminal need carry out new data transmission, all the other terminals were for the demand probability calculation of this business tine in network side covered again.
Wherein network side is to the demand probability P of all the other terminals in covering for this business tine
UECalculate by following formula:
P
UE=P(UE|UE_ID,UE_POS,TASK_CLASS,TASK_TIME,TASK_LIFE…)
Wherein, UE_ID represents the user, and UE_POS represents customer location, and TASK_CLASS represents type of service, and TASK_TIME represents the professional initiation time, and TASK_LIFE represents professional life, and ellipsis is represented adeditive attribute.
Network side is according to business tine, and other terminal use's custom under residential quarter, requested service terminal place and the covering of adjacent residential quarter, channel status, calculate cell scheduling strategy and terminal scheduling strategy, calculate the modulating-coding strategy according to channel status, extrapolate the transmission expected rate Rmax that uses after this method is optimized, do not use the clean culture transmission rate Rsingle of this method, and use the income Rmax/Rsingle after this method:
If when network uses prediction income that the mode of multicast obtains less than predefined expected revenus, use the mode of traditional unicast to send data;
If when network side prediction uses the pre-propelling data of multicast mode to obtain income greater than predefined minimum expected revenus, then use the pre-mode that pushes of multicast to send data.
According to described optimisation strategy, selection scheduling participates in the alternative cell of multicast propelling movement and the alternative terminal in these residential quarters, send the multicast sending out notice by core net to alternative cell, notify each alternative cell to cover the interior alternative Termination ID that multicast pushes that participates in, the physical source distributing situation, modulation coding mode is by each alternative cell alternative terminal in the dispatching cell coverage separately.
Because terminal may be in different conditions in network side covered, therefore be divided into following situation at their state and dispatch:
A) for being in connected state (connected), the terminal of state of activation/continuous accepting state (active), because its lasting monitoring control channel message, therefore can directly arrive at control channel notice downlink data, downlink data physical resource position, information such as modulating-coding strategy, and keep the connected_active state;
B) for being in connected state, the terminal of discontinuous receiving state, because terminal is ability reading control signal channel when its discontinuous listening period arrives only, therefore network side is when the discontinuous listening period of each terminal arrives, control channel in terminal sends schedule information, activated terminals makes it enter the connected_active state;
C) for the terminal that is in idle condition, need network side at first to terminal, initiate paging, triggering terminal connects, and after terminal initial connection foundation was finished, terminal directly entered the connected_active state.
After the terminal of the pre-propelling data of full entry multicast enters the connected_active state, each terminal is monitored the control channel of oneself continuously, network side sends the physical resource position of multi-case data in control channel, modulation coding mode, after each terminal received the control signaling, beginning received data in the physical resource position of network side appointment.
According to terminal QoS demand, network side determines terminal to carry out HARQ and data re-transmission opportunity, and after data sent and finish, the pre-propelling movement of network data multicast this time finished, and interrupts connecting.
The present invention is based on the pre-method for pushing of network data of multicast, utilize the correlation of network data service, when a terminal request network data, network side is according to the user behavior data that accumulated in the past, whether the business tine of this time request, the current business of making a strategic decision out are applicable to that multicast pushes.In conjunction with the current network load state, all the other terminal channel states in the residential quarter covers, network side scheduling proper cell and terminal, the pre-propelling data of mode of use multicast.When a terminal has successfully been used pre-propelling data, its can provide a feedback for network side, in order to optimize user behavior analysis.Multicast among the present invention pushes mode, utilized the redundancy in data transmission in network fully, the data that may be used by a plurality of users, what the mode by multicast when it is for the first time requested sent to has other terminal of similar demands to this business, by the once consumption of professional transfer resource, finish a plurality of terminal business demand in future.The present invention has overcome in the legacy network data service, and the shortcoming that part focus business is repeated to transmit under the condition that does not influence the Terminal Service of initiating service request, has improved resource utilization ratio.
Description of drawings
Fig. 1 upgrades and business demand probability calculation FB(flow block) for user behavior data storehouse among the present invention.
The pre-method for pushing FB(flow block) of the network data based on multicast that Fig. 2 proposes for the present invention.
Embodiment
The present invention is described further below in conjunction with drawings and Examples.
The pre-method for pushing of the network data based on multicast that the present invention proposes, its FB(flow block) may further comprise the steps as shown in Figure 1:
When (1) terminal that pushes when network enabled data are pre-has the network data request, according to the pre-propelling data buffer memory of content search of request, whether seek in that certain has received data content of request this time by the mode of pre-propelling movement constantly before.
(2) terminal of requested service generates upstream data, and the information of service request of oneself is put into upstream message.Whether successfully receive by the mode of pre-propelling movement according to the business datum of this request, perhaps this terminal needs more new data, whether need to receive new data by the terminal decision-making, the result of decision is adhered to a Flag marker bit in upstream message, whether the sign terminal needs to receive new data.
(3) terminal is set up link with network side, and network side receives the customer service request.Because different user has correlation for the demand of business, the same user of this correlation (UE_ID), customer location (UE_POS), type of service (TASK_CLASS), the professional initiation time (TASK_TIME), this business life (TASK_LIFE) and other are may attribute relevant, so the user is the conditional probability relevant with these attributes for the demand probability of business:
P
UE=P(UE|UE_ID,UE_POS,TASK_CLASS,TASK_TIME,TASK_LIFE…)
For the service request that receives, network side can calculate other user for this professional demand by this formula, thereby judges that other user is for the possibility of this business demand.The concrete operations flow process of step 3 is as follows:
A) network side receives the customer service request.
B) time in the analysis business, attributes such as positional information for calculating other user to these professional conditions of demand, need carry out discretization with the attribute in this business information.The professional time of initiating will be as the starting point of this business hours attribute (TASK_TIME) first, and the business of the same hereinafter all need be with this time attribute as oneself.For temporal information, can be accurate to different time grades according to actual conditions, as with the different dates as different time attribute or will be divided into the time attribute that several time periods initiate as business every day.Life duration (TASK_LIFE) for business, namely calculate the current time (CUR_TASK_TIME), with the time interval of zero-time: TASK_LIFE=CUR_TASK_TIME-TASK_TIME, and as required it is carried out discretization, for example: in 3 days, 3 days-6 days ...For the area attribute (UE_POS) of business, the physical coordinates in the time of can initiating business according to the user is as dividing foundation, perhaps with the residential quarter, place as dividing foundation, in order to reduce amount of calculation, can merge one or several areas and regard it as identical area.For type of service (TASK_CLASS), classify according to professional actual conditions, as sport category, classification modes such as amusement class.By analyzing this time professional solicited message, obtain this professional property set:
S={UE_ID，UE_POS，TASK_CLASS，TASK_TIME，TASK_LIFE…}。
C) network side detects the Flag marker bit, then enters step d) if this time service needed is initiated new transfer of data, otherwise enters step e)
D) calculate this residential quarter and adjacent residential quarter for the demand probability of this time business:
P
UE=P(UE|UE_ID,UE_POS,TASK_CLASS,TASK_TIME,TASK_LIFE…)
Concrete computational methods are as follows:
Suppose that total service request record strip number is N, wherein add up to COUNT (UE) by the business of UE demand in the past, then P (UE) computing formula is:
P (S|UE)=P (UE_ID, UE_POS, TASK_CLASS, TASK_TIME, TASK_LIFE ... | UE) suppose not have correlation between each attribute, then following formula can be expressed as:
P(S|UE)=P(UE_ID|UE)P(UE_POS|UE)P(TASK_CLASS|UE)...
The example that is calculated as with P (UE_POS|UE):
(UE_POS UE) is this UE initiates service request at the UE_POS place sum to COUNT
For P(S) be an only variable relevant with attribute, can suppose that it is steady state value, do not participate in calculating.
E) with this professional original legacy data of new information update storehouse that obtains, update method is as follows:
Being index with this business (TASK_ID) adds a new tuple in database, the attribute of this tuple is the UE_ID of this request, recomputate the correlation between the UE, the UE that before namely searching for again this TASK_ID is initiated demand, symmetry is upgraded two relevant UE:COUNT(UE_ID, UE)=COUTN (UE_ID, UE)+1, recomputate other association attributes that refreshes this UE simultaneously:
For calculating P (UE), need to upgrade: N=N+1, COUNT (UE_ID)=COUNT (UE_ID+1);
For other conditional probability, need to upgrade: COUNT (UE_POS, UE_ID)=COUNT (UE_POS, UE_ID)+1
F) detect the Flag marker bit, if this time business only is the reporting message that once pre-propelling movement content is used, then this time business stops, and disconnects connecting.Otherwise proceed step 4.
(4) need carry out new data when sending when detecting terminal, network side is according to business tine, and other terminal use's custom under residential quarter, requested service terminal place and the covering of adjacent residential quarter, channel status, calculate cell scheduling strategy and terminal scheduling strategy, calculate the modulating-coding strategy according to channel status, the send mode of optimization expected revenus maximum, and make comparisons with the minimum expected revenus that multicast sends.
Obtained different terminals for these professional conditions of demand by step 3, the UE maximum number of supposing to participate in simultaneously multicast is Nmax, whole UE numbers are Ncur in the multicast range, and then this problem is a combinatorial optimization problem: namely select the feasible data total throughout expectation maximization that sends of Nmax at the most from Ncur UE.
This problem can be expressed as:
a)Rmax=max{min(R
UE0,R
UE1,...)*[1+Σf(P
UEi)]}
B) s.t:UE ∈ Ncur, UE sum＜Nmax
c)Power>max(POWER(UEi))
F (P wherein
UEi) be P
UEiMonotonic increasing function, span [0,1] is as the weight coefficient of optimization aim function.Power is the base station maximum transmission power, and max (POWER (UEi)) expression in order to reach Rmax, requires the maximum needed transmitting power of UEi to transmitted power, guarantee that each base station total emission power is less than its maximum transmission power.
By the shannon capacity formula as can be known, the theoretical maximum velocity that can support for single terminal is:
Rsingle=w*log(1+SNR)[b/Hz]
Calculate comparatively simple for R signal to noise ratio (snr) when the single subdistrict:
Suppose that cell transmit power is P, noise power is P in the bandwidth
N, SNR is in single residential quarter:
For situation from a plurality of cell coordinations to terminal transmission data that use, i cell transmit power of price is P
i, as the path loss position PL of his incoming terminal
i, then its receiving terminal signal to noise ratio is:
By bringing the SNR computing formula into top optimization problem, can solve the Rmax of the problems referred to above optimal solution, by calculating
Judge, if greater than setting threshold, then use the multicast mode to push in advance, otherwise use the traditional approach clean culture to send.
For real system, according to the SNR of the terminal acquisition of tabling look-up, he is corresponding to the modulation system of terminal, and code rate usually for the transmission rate of network side final decision.Unification here is made as R with final transmission rate
Max
(5) if when network uses prediction income that the mode of multicast obtains less than predefined expected revenus, use the mode of traditional unicast to send data.If when network side prediction uses the pre-propelling data of multicast mode to obtain income greater than predefined minimum expected revenus, then use the pre-mode that pushes of multicast to send data.
(6) network side is according to the optimisation strategy in the step (4), selection scheduling participates in the alternative cell of multicast propelling movement and the alternative terminal in these residential quarters, send the multicast sending out notice by core net to alternative cell, notify each alternative cell to cover the interior alternative Termination ID that multicast pushes that participates in, the physical source distributing situation, modulation coding mode is by each alternative cell alternative terminal in the dispatching cell coverage separately.
(7) since in the residential quarter terminal may be in different conditions, so be divided into following situation at their state and dispatch:
A) for being in connected state (connected), the terminal of state of activation/continuous accepting state (active), because its lasting monitoring control channel message, therefore can directly arrive at control channel notice downlink data, downlink data physical resource position, information such as modulating-coding strategy, and keep the connected_active state.
B) for being in connected state, the terminal of discontinuous receiving state, because terminal is ability reading control signal channel when its discontinuous listening period arrives only, therefore network side is when the discontinuous listening period of each terminal arrives, control channel in terminal sends schedule information, activated terminals makes it enter the connected_active state.Because end at connected state, therefore in the case, has been saved RRC link setup equal time, terminal can be transferred to continuous accepting state faster, and computing formula is as follows constantly for terminal monitoring:
Short period:
[(SFN*10)+subframe?number]%(shortDRX_Cycle)=(drxStartOffset)%(shortDRX_Cycle)
Long period:
[(SFN*10)+subframe?number]%(longDRX_Cycle)=(drxStartOffset)%(longDRX_Cycle)
Above parameter is finished configuration by rrc layer
C) for the terminal that is in idle condition, need network side at first to terminal, initiate paging, triggering terminal connects, and after terminal initial connection foundation was finished, terminal directly entered the connected_active state.For the terminal that is in Idle state, there has not been this moment RRC to connect and distribute to user's specific resource, terminal needs monitoring seek channel and Broadcast Control Channel, the time cycle of monitoring this moment is by the control of NAS message, be example with the LTE system, computing formula is as follows constantly for the terminal monitoring paging channel:
The monitoring frame number calculates
SFN%T=(T/N)*(UE_ID%N)
The monitoring subframe is calculated
T=min (Tc(residential quarter specify default paging cycle), Tue(terminal acquiescence paging cycle))
N=min (T, the number of sub frames of monitoring in every frame ' T)
Ns=max (1, the number of sub frames of monitoring in every frame)
Wherein the duration of T is 32-256 subframe, and whole paging may be introduced average delay less than 500ms.
After receiving paging, terminal is connected needs initiation access at random in order to set up RRC with network, each time slot can dispose 64 random access resources at most for the LTE system, it is relevant with the system configuration frame format that concrete per second allows to insert at random number of times, FDD frame format wherein: 6400-64000 time, tdd frame form: 3200-38400 time.By emulation as can be known, produce time-delay＜1s altogether.
(8) after the terminal of the pre-propelling data of full entry multicast enters the connected_active state, each terminal is monitored the control channel of oneself continuously, network side sends the physical resource position of multi-case data in control channel, modulation coding mode, after each terminal received the control signaling, beginning received data in the physical resource position of network side appointment.
(9) according to terminal QoS demand, network side determines terminal to carry out HARQ and data re-transmission opportunity, retransmits to finish the back and continue (8).
(10) after data sent and finish, the pre-propelling movement of network data multicast this time finished, and interrupts connecting.
Claims (8)
1. pre-method for pushing of the network data based on multicast, it is characterized in that, the user behavior data of terminal in network side accumulates its covering, when a certain user terminal requests network data, network side is according to the business tine of this accumulation data and this time request, if judge all the other terminals in covering for the demand probability of this business tine greater than predefined value, then use the pre-propelling data of mode of multicast, when sending data to the active user, finish a plurality of terminal business demand in future.
2. according to the pre-method for pushing of the described network data based on multicast of claim 1, it is characterized in that, when a user terminal requests network data, earlier according to the pre-propelling data buffer memory of content search of asking, whether seek in that certain has received data content of request this time by the mode of pre-propelling movement constantly before, if do not receive, perhaps new data need be upgraded and receive to this terminal, this user terminal generates upstream data, the information of service request of oneself is put into upstream message, and adhere to the Flag marker bit whether a sign needs to receive new data; After user terminal is set up link with network side, send request msg, network side detects request content, user terminal ID utilizes more new business temperature database of request content, upgrades the user behavior data storehouse according to user behavior, detect the Flag marker bit, if this user terminal does not need the data that please look for novelty, then conversation end this time disconnects network connection; If when this user terminal need carry out new data transmission, all the other terminals were for the demand probability calculation of this business tine in network side covered again.
3. according to claim 1 or the pre-method for pushing of 2 described network datas based on multicast, it is characterized in that network side is to the demand probability P of all the other terminals in covering for this business tine
UECalculate by following formula:
P
UE=P(UE|UE_ID,UE_POS,TASK_CLASS,TASK_TIME,TASK_LIFE…)
Wherein, UE_ID represents the user, and UE_POS represents customer location, and TASK_CLASS represents type of service, and TASK_TIME represents the professional initiation time, and TASK_LIFE represents professional life, and ellipsis is represented adeditive attribute.
4. according to the pre-method for pushing of the described network data based on multicast of claim 2, it is characterized in that, network side is according to business tine, and other terminal use's custom under residential quarter, requested service terminal place and the covering of adjacent residential quarter, channel status, calculate cell scheduling strategy and terminal scheduling strategy, calculate the modulating-coding strategy according to channel status, extrapolate the transmission expected rate Rmax that uses after this method is optimized, do not use the clean culture transmission rate Rsingle of this method, and use the income Rmax/Rsingle after we send out:
If when network uses prediction income that the mode of multicast obtains less than predefined expected revenus, use the mode of traditional unicast to send data;
If when network side prediction uses the pre-propelling data of multicast mode to obtain income greater than predefined minimum expected revenus, then use the pre-mode that pushes of multicast to send data.
5. according to the pre-method for pushing of the described network data based on multicast of claim 4, it is characterized in that, according to described optimisation strategy, selection scheduling participates in the alternative cell of multicast propelling movement and the alternative terminal in these residential quarters, send the multicast sending out notice by core net to alternative cell, notify each alternative cell to cover the interior alternative Termination ID that multicast pushes, the physical source distributing situation of participating in, modulation coding mode is by each alternative cell alternative terminal in the dispatching cell coverage separately.
6. according to the pre-method for pushing of the described network data based on multicast of claim 4, it is characterized in that and since network side cover in terminal may be in different conditions, therefore be divided into following situation at their state and dispatch:
A) for being in connected state (connected), the terminal of state of activation/continuous accepting state (active), because its lasting monitoring control channel message, therefore can directly arrive at control channel notice downlink data, downlink data physical resource position, information such as modulating-coding strategy, and keep the connected_active state;
B) for being in connected state, the terminal of discontinuous receiving state, because terminal is ability reading control signal channel when its discontinuous listening period arrives only, therefore network side is when the discontinuous listening period of each terminal arrives, control channel in terminal sends schedule information, activated terminals makes it enter the connected_active state;
C) for the terminal that is in idle condition, need network side at first to terminal, initiate paging, triggering terminal connects, and after terminal initial connection foundation was finished, terminal directly entered the connected_active state.
7. according to the pre-method for pushing of the described network data based on multicast of claim 6, it is characterized in that, after the terminal of the pre-propelling data of full entry multicast enters the connected_active state, each terminal is monitored the control channel of oneself continuously, network side sends the physical resource position of multi-case data in control channel, after modulation coding mode, each terminal received the control signaling, beginning received data in the physical resource position of network side appointment.
8. according to the pre-method for pushing of the described network data based on multicast of claim 6, it is characterized in that, according to terminal QoS demand, network side determines terminal to carry out HARQ and data re-transmission opportunity, after data sent and finish, the pre-propelling movement of network data multicast this time finished, and interrupts connecting.
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| CN104640224A (en) * | 2013-11-12 | 2015-05-20 | 华为技术有限公司 | Network data transmission method, device and system |
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| CN105338549A (en) * | 2014-08-11 | 2016-02-17 | 华为技术有限公司 | Method and equipment for determining multimedia data sending mode |
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| CN105992155A (en) * | 2015-01-30 | 2016-10-05 | 中国移动通信集团公司 | Method, device and system for unicast-multicast dynamic switching in network |
| CN109547944A (en) * | 2017-09-21 | 2019-03-29 | 华为技术有限公司 | The method and device of data transmission |
| CN109542207A (en) * | 2018-11-30 | 2019-03-29 | 河南工学院 | A kind of method and device pushing travel information |
| CN110267303A (en) * | 2019-04-22 | 2019-09-20 | 北京邮电大学 | A kind of method for pushing and equipment of information |
| CN111200639A (en) * | 2019-12-20 | 2020-05-26 | 上海淇玥信息技术有限公司 | Information pushing method and device based on user operation behavior and electronic equipment |
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| US10205668B2 (en) | 2014-02-22 | 2019-02-12 | Huawei Technologies Co., Ltd. | Video data transmission method and related device |
| CN105338549A (en) * | 2014-08-11 | 2016-02-17 | 华为技术有限公司 | Method and equipment for determining multimedia data sending mode |
| CN105516994B (en) * | 2014-09-25 | 2018-12-25 | 华为技术有限公司 | A kind of bandwidth allocation methods and equipment |
| CN105516994A (en) * | 2014-09-25 | 2016-04-20 | 华为技术有限公司 | Bandwidth distribution method and device |
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| CN109547944A (en) * | 2017-09-21 | 2019-03-29 | 华为技术有限公司 | The method and device of data transmission |
| CN109542207A (en) * | 2018-11-30 | 2019-03-29 | 河南工学院 | A kind of method and device pushing travel information |
| CN110267303A (en) * | 2019-04-22 | 2019-09-20 | 北京邮电大学 | A kind of method for pushing and equipment of information |
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| CN111200639A (en) * | 2019-12-20 | 2020-05-26 | 上海淇玥信息技术有限公司 | Information pushing method and device based on user operation behavior and electronic equipment |
| CN111200639B (en) * | 2019-12-20 | 2023-04-07 | 上海淇玥信息技术有限公司 | Information pushing method and device based on user operation behavior and electronic equipment |
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