CN105519194B - Method for distributing neighbor discovery resources - Google Patents
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Abstract
The present invention relates to a method for a base station to allocate neighbor discovery resources and a user equipment to transmit a neighbor discovery signal in a wireless communication system. Wherein the network formed by the base station supporting neighbor discovery supports both a first type of discovery mechanism that is non-dedicated based on user equipment and a second type of discovery mechanism that is dedicated based on user equipment. The method can be used for a resource allocation method of D2D neighbor discovery of a cellular network, which enables the network to flexibly allocate neighbor discovery resources according to network conditions. In addition, the assignment can enable prioritization based on subscriptions, collision probability, and the like, thereby improving user experience. Furthermore, the method enables both connected and dormant ues to support neighbor discovery.
Description
Technical Field
The present invention relates to the field of wireless communication, and more particularly, to a method for allocating neighbor discovery resources.
Background
Device-to-Device (D2D) communication is being focused on by standardization organizations such as 3GPP SA and RAN as a 3GPP release 12 technology to support various scenarios such as public safety and business applications. A necessary and core component of D2D communication is neighbor discovery of surrounding user devices. In the present phase, two types of neighbor discovery are defined in the RAN1, as follows:
type 1: the discovery process allocates resources for discovery signal transmission based on non-user equipment dedication, wherein the resources are available for all user equipment or a group of user equipment;
type 2: the discovery process allocates resources for discovery signal transmission based on user equipment dedication, wherein:
a) type 2A: resources are dynamically allocated to each dedicated neighbor discovery signal transmission instance;
b) type 2B: resources are semi-persistently allocated to each dedicated neighbor discovery signal instance.
From the above definitions, the discovery of type 1 is a contention-based solution, while the discovery of type 2 is a non-contention-based solution. In fact, each of the above two types of discovery processes has its advantages and disadvantages. The following table shows some of the results of the analysis for the above two types:
table 1: advantages and disadvantages of type 1 and type 2
However, detailed embodiments for neighbor discovery have not been clearly presented so far. And do not ultimately decide what type of discovery will be applied in 3GPP due to their respective advantages and disadvantages, which are crucial to support device-to-device communication under cellular networks.
Disclosure of Invention
In light of the above understanding of the background art and the problems with the prior art, the present invention proposes a detailed resource allocation method for neighbor discovery. In particular, in the present invention, a network for neighbor discovery will support both type 1 (non-user equipment specific) discovery and type 2 (user equipment specific) discovery. The base station can semi-statically allocate discovery resources of type 1 and type 2 according to network conditions, such as discovery load conditions, user equipment characteristics, discovery collision conditions, and the like. The base station should broadcast type 1 resources to all user equipments by means of its system broadcast information, while type 2 resources dedicated to the user equipments are sent to specific user equipments according to user neighbor discovery needs.
The resources allocated to type 1 and type 2 neighbor discovery can be configured in TDM or FDM or joint TDM/FDM fashion. In type 1 resources, the user equipment is able to autonomously transmit the discovery signal based on carrier sensing or based on predefined rules, which will be given in the following embodiments specifically based on user equipment identity and neighbor discovery subframes. To reduce transmission collisions, a time hopping scheme based on the user equipment identity will be introduced into the discovery period and some hash function (hash function) is required to determine when the user equipment should transmit its discovery signal. Whereas in type 2 resources, the base station can explicitly allocate discovery resources to each D2D user equipment.
Additionally, the base station can determine which user equipment can use which type of discovery resource. Typically, the type 2 resources, which are based on user equipment-specific and non-contention, can be applied to user equipment in a connected state, e.g., user equipment with a high collision probability, a high subscription priority, etc. Whereas e.g. user equipments in a dormant state and user equipments in a connected state with a low collision probability, a low subscription priority, etc. are able to apply contention based resources of type 1.
Further, for each type of discovery mechanism, user equipments with different priorities are allowed to transmit their discovery signals with different transmission opportunities in one discovery period. For example, a user equipment with a high subscription priority is allowed to transmit its discovery signal multiple times with a high transmission opportunity in one discovery period. This will enable an increased probability of discovery of these user devices to other surrounding user devices and improve the potential D2D communication opportunities. Conversely, a user equipment with a low subscription priority is allowed to transmit its discovery signal only once in a single discovery period. This will lead to more discovery flexibility for the network and a good user experience for the user.
More specifically, a first aspect of the present invention proposes a method for allocating neighbor discovery resources in a base station in a wireless communication system, characterized in that a network supporting neighbor discovery formed by the base station supports both a first type of discovery mechanism based on non-user equipment dedication and a second type of discovery mechanism based on user equipment dedication.
In a preferred embodiment of the present invention, the base station semi-statically allocates resources for the first type of neighbor discovery and resources for the second type of neighbor discovery according to network conditions.
In a preferred embodiment of the invention, the network condition comprises at least one of:
-discovering a signal load condition;
-a user equipment characteristic; and
-finding a signal collision condition.
In a preferred embodiment of the invention, the base station broadcasts the resources of the first type to all user equipments by means of system broadcast information.
In a preferred embodiment of the present invention, the base station transmits the second type of resource to the specific user equipment according to a neighbor discovery requirement of the specific user equipment.
In a preferred embodiment of the present invention, the base station configures resources allocated to the first type and the second type of discovery in a TDM or FDM or joint TDM/FDM manner.
In a preferred embodiment of the present invention, the base station applies a time hopping scheme decided based on user equipment identity or based on neighbor discovery subframes within and between the discovery period.
In a preferred embodiment of the present invention, the time hopping scheme includes:
-
wherein N is1Indicating a number of discovery subframes for the first type of neighbor discovery mechanism in one discovery period, t being the current discovery period, M indicating a number of PRB pairs in each discovery subframe, I representing a number of allowed transmission opportunities, (M)i(t)，ni(t)) are each independentlyIndex of PRB pair used during ith transmission and discovery subframe and mi(t)＜M；ni(t)＜N1；mi(1) — 50, and the UE _ ID of the dormant UE is (IMSI mod 1024), and the UE _ ID of the connected UE is its C-RNTI; or
-
Wherein, Yi＝(A·Yi-1)mod D，i＝0，…，I-1，Y-1UE identity ≠ 0, a 39827, D65537 and
nsis the index of the slot allocated to neighbor discovery in one radio frame, and Δ is the predefined time interval between transmission opportunities and is configured by the network through higher layer messages.
In a preferred embodiment of the present invention, the wireless communication system includes an LTE system and an IEEE 802.16m system.
In a preferred embodiment of the present invention, the resources for the first type of discovery and the resources for the second type of discovery are configured orthogonally to each other.
The second aspect of the present invention also proposes a method of selecting resources for neighbor discovery in a user equipment in a wireless communication system, characterized in that the user equipment autonomously transmits a discovery signal based on carrier sensing or based on predefined rules.
In a preferred embodiment of the invention, the predefined rule comprises a time hopping scheme in the form of a hash function, wherein the time hopping scheme comprises:
-
wherein N is1Indicating a number of discovery subframes for the first type of neighbor discovery mechanism in one discovery period, t being the current discovery period, M indicating a number of PRB pairs in each discovery subframe, I representing allowedNumber of transmission opportunities (m)i(t)，ni(t)) index and discovery subframe of PRB pair used during ith transmission, respectively and mi(t)＜M；ni(t)＜N1；mi(1) — 50, and the UE _ ID of the dormant UE is (IMSI mod 1024), and the UE _ ID of the connected UE is its C-RNTI; or
-
Wherein, Yi＝(A·Yi-1)mod D，i＝0，…，I-1，Y-1UE identity ≠ 0, a 39827, D65537 and
nsis the index of the slot allocated to neighbor discovery in one radio frame, and Δ is the predefined time interval between transmission opportunities and is configured by the network through higher layer messages.
The invention provides a resource allocation method for D2D neighbor discovery of a cellular network, which enables the network to flexibly allocate neighbor discovery resources according to network conditions. In addition, the assignment can enable prioritization based on subscriptions, collision probability, and the like, thereby improving user experience. Furthermore, the method enables both connected and dormant ues to support neighbor discovery.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments thereof, which proceeds with reference to the accompanying drawings.
Fig. 1 shows an application scenario of the method according to the invention; and
FIG. 2 illustrates a schematic diagram of resource allocation of type 1 and type 2 in a TDM manner in accordance with the present invention;
FIG. 3 shows a schematic resource allocation diagram of type 1 and type 2 in a joint TDM/FDM manner according to the present invention;
FIG. 4 shows a flow diagram of distinguishing resources among base stations;
FIG. 5 shows a schematic diagram of resource allocation of type 1 and type 2 applying a time hopping scheme; and
fig. 6 shows a flow chart of a method for using a base station and a user equipment according to the present invention.
In the drawings, like or similar reference numbers indicate like or similar devices (modules) or steps throughout the different views.
Detailed Description
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Fig. 1 shows an application scenario of the method according to the present invention, i.e. there will be a mutual discovery requirement between UE1 and UE 2.
A detailed discovery procedure design scheme, which can be applied to the LTE system, will be described below. Of course, similarly, those skilled in the art will appreciate that the scheme should be applicable to other systems, such as IEEE 802.16m systems. The main idea of the present invention will be described in three aspects, which are: resource allocation, discovery transmission opportunities, and acquisition subscription priority for type 1 and type 2 neighbor discovery.
1. Resource allocation for type 1 and type 2 discovery
The base station will allocate the discovery resources of type 1 and type 2 in TDM, FDM, or a combined TDM/FDM fashion based on current network conditions. Fig. 2 shows a schematic diagram of resource allocation of type 1 and type 2 in TDM manner according to the present invention, and fig. 3 shows a schematic diagram of resource allocation of type 1 and type 2 in joint TDM/FDM manner according to the present invention. In the discovery subframe, the resources of type 1 and the resources of type 2 are configured orthogonally to each other.
The resource configuration can be semi-static. As an example, if the number of user equipments with neighbor discovery needs is small, more type 2 resources can be configured. Conversely, more resources of type 1 can be configured. The base station will broadcast the type 1 resources to all user equipments in the system broadcast information, e.g. in SIB 1. For type 2 resources, the base station sends an explicit user equipment specific command to indicate the resources for discovery.
Additionally, the base station can determine which connected user equipments use which type of discovery resources on a per user equipment basis. Typically, the type 2 resource can be applied to a user equipment in a connected state, for example, a user equipment having a high collision possibility, a high subscription priority, and the like. While user equipments in connected state and in dormant state, e.g. with low collision probability, low subscription priority, etc., are able to apply contention based resources of type 1. Fig. 4 shows a flow diagram for distinguishing between resources in a base station.
2. Discovering transmission opportunities
As described above, a high priority user equipment is allowed to transmit a discovery signal for a plurality of times in one discovery period, thereby enabling other user equipments to discover the user equipment with a high probability. The priority can be determined by the subscription priority of the user equipment or the decision of the base station itself, such as collision probability. In particular, for contention-based discovery user equipment of type 1, it is advantageous to determine and design some rules based on user equipment identity and neighbor discovery subframes. Here, a time hopping scheme in the form of a hash function will be introduced to reduce the likelihood of collisions. An example is given below:
fig. 5 shows a schematic diagram of resource allocation of type 1 and type 2 to which a time hopping scheme is applied. Let N1 indicate the number of discovery subframes used for the type 1 neighbor discovery mechanism in one discovery period, t is the current discovery period, and M indicates the number of PRB pairs in each discovery process. I denotes allowed transmission opportunitiesThe number of the cells. (m)i(t)，ni(t)) index and discovery subframe of PRB pair used during ith transmission, respectively and mi(t)＜M；ni(t)＜N1. Ni (t) is given by the following formula:
i＝0，1，...，I-1 (1)
wherein, at the beginning mi(-1) ═ 50. Note that the above formula is cyclically shifted by a period N1. And m is autonomously selected by the user equipmenti(t) of (d). Each user equipment may transmit its discovery signal using the selected PRB pair.
For a dormant user equipment, its UE _ ID is given as (IMSI mod 1024). For connected user equipments, the UE _ ID is its C-RNTI itself. The above formula enables the user equipments transmitting on the same subframe to introduce mi(t-1) and not transmitted on the same subframe the next time. This greatly increases the probability of discovery. As shown in FIG. 2, the priority among them is UE3 > UE2 > UE 1. And the discovery signal of UE2 and the discovery signal of UE3 would be transmitted twice compared to the discovery signal of UE1 only once.
In another example of implementation, there is the following formula to determine ni(t), which is similar to the search space design of PDCCH, namely:
FIG. 5, which follows, shows an example of the above formula with priorities UE3 > UE2 > UE 1. And the discovery signal of UE2 and the discovery signal of UE3 would be transmitted twice compared to the discovery signal of UE1 only once. Here, Δ ═ 2 is merely exemplary.
It will be appreciated by those skilled in the art that the present invention is not limited to the above equations. Other forms of formulas and hash functions based on the UE _ ID and possibly with the used discovery subframes are also within the scope of the invention.
For type 2 discovered user equipment, the base station can explicitly transmit (m)i(t)，ni(t)) to transmit its discovery signal.
3. Obtaining subscription priority
Fig. 6 shows a flow chart of a method for using a base station and a user equipment according to the present invention. The first four steps are prior art and are not described herein. In the 5 th step the base station will acquire a predetermined priority and in the 6 th step the discovery resources of type 1 and type 2 are differentiated based on the acquired subscription priority.
The base station can obtain a subscription priority to determine discovery resource allocation. For this purpose, fig. 5 shows a simplified registration and authentication procedure. After accessing the service, the server determines the subscription priority and should send its acknowledgement message to the corresponding base station. Based on this, the base station can determine whether to allocate type 1 or type 2 resources to the user equipment accordingly.
The invention provides a resource allocation method for D2D discovery of a cellular network, which enables the network to flexibly allocate discovery resources according to network conditions. In addition, the assignment can enable prioritization based on subscriptions, collision probability, and the like, thereby improving user experience. Furthermore, the method enables both connected and dormant ues to support neighbor discovery.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. Furthermore, it will be obvious that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Several elements recited in the apparatus claims may also be implemented by one element. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (11)
1. A method for allocating neighbor discovery resources in a base station in a wireless communication system, wherein a network supporting neighbor discovery formed by the base station simultaneously supports a first type of discovery mechanism based on non-user equipment dedication and a second type of discovery mechanism based on user equipment dedication,
wherein the base station applies a time hopping scheme decided based on user equipment identification or based on neighbor discovery subframes for resources for the first type of neighbor discovery within a discovery period.
2. The method of claim 1, wherein the base station semi-statically allocates resources for the first type of neighbor discovery and resources for the second type of neighbor discovery based on network conditions.
3. The method of claim 2, wherein the network condition comprises at least one of:
-discovering a signal load condition;
-a user equipment characteristic; and
-finding a signal collision condition.
4. The method of claim 1, wherein the base station broadcasts the first type of resource to all user equipments by means of system broadcast information.
5. The method of claim 1, wherein the base station transmits the second type of resource to the particular user equipment according to neighbor discovery needs of the particular user equipment.
6. The method of claim 1, wherein the base station configures resources allocated to the first and second types of discovery in a TDM or FDM or joint TDM/FDM fashion.
7. The method of claim 1, wherein the time hopping scheme comprises:
-
wherein N is1Indicating a number of discovery subframes for the first type of neighbor discovery mechanism in one discovery period, t being the current discovery period, M indicating a number of PRB pairs in each discovery subframe, I representing a number of allowed transmission opportunities, (M)i(t),ni(t)) index and discovery subframe of PRB pair used during ith transmission, respectively and mi(t)<M；ni(t)<N1；mi(1) — 50, and the UE _ ID of the dormant UE is (IMSI mod 1024), and the UE _ ID of the connected UE is its C-RNTI; or
-
Wherein, Yi＝(A·Yi-1)modD，i＝0,…,I-1，Y-1UE identity ≠ 0, a 39827, D65537 and
nsis the index of the slot allocated to neighbor discovery in one radio frame, and Δ is the predefined time interval between transmission opportunities and is configured by the network through higher layer messages.
8. The method of claim 1, wherein the wireless communication system comprises an LTE system and an IEEE 802.16m system.
9. The method of claim 1, wherein resources for the first type of discovery and resources for the second type of discovery are configured orthogonally to each other.
10. A method in a user equipment in a wireless communication system for selecting resources for neighbor discovery,
the wireless communication system comprises a base station, wherein a network formed by the base station and supporting neighbor discovery simultaneously supports a first type of discovery mechanism based on non-exclusive use of user equipment and a second type of discovery mechanism based on exclusive use of user equipment; and
the user equipment autonomously transmits discovery signals based on predefined rules, wherein the predefined rules include a time hopping scheme in the form of a hash function and decided based on user equipment identification or based on neighbor discovery subframes.
11. The method of claim 10, wherein the time hopping scheme comprises:
-
wherein N is1Indicating a number of discovery subframes for the first type of discovery mechanism in one discovery period, t being the current discovery period, M indicating a number of PRB pairs in each discovery subframe, I representing a number of allowed transmission opportunities, (M)i(t),ni(t)) index and discovery subframe of PRB pair used during ith transmission, respectively and mi(t)<M；ni(t)<N1；mi(1) — 50, and the UE _ ID of the dormant UE is (IMSI mod 1024), and the UE _ ID of the connected UE is its C-RNTI; or
-
Wherein, Yi＝(A·Yi-1)modD，i＝0,…,I-1，Y-1UE identity ≠ 0, a 39827, D65537 and
nsis the index of the slot allocated to neighbor discovery in one radio frame, and Δ is the predefined time interval between transmission opportunities and is configured by the network through higher layer messages.
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