A method comprising: receiving, at a computing device, a digital broadcast signal that includes upper layer signalling information (403-a) and layer 2 signalling information (405-a) for a broadcast protocol, the upper layer signalling information including service association information and the layer 2 signalling information including local multiplex information and other multiplex information, wherein the local multiplex information is related to a first multiplex of a first cell of a network, and the other multiplex information is related to a second multiplex of a second cell of the network and includes a frequency parameter of the second multiplex; locating a physical layer pipe carrying the upper layer signalling information; locating a physical layer pipe carrying at least part of the layer 2 signalling information; extracting the service association information from the physical layer pipe carrying the upper layer signalling information, wherein the service association information includes information associating a uniform resource identifier of a service with one or more component identifiers; extracting the local multiplex information and the other multiplex information from the physical layer pipe carrying said at least part of the layer 2 signalling information, wherein the extracted local multiplex information includes a list of components that are carried within the first multiplex and the extracted other multiplex information includes a list of components that are carried within the second multiplex, and wherein the lists of components include the one or more component identifiers; and storing information related to the extracted service association information, the extracted local multiplex information and the extracted other multiplex information. receiving, at a computing device, a digital broadcast signal that includes upper layer signalling information (403-a) and layer 2 signalling information (405-a) for a broadcast protocol, the upper layer signalling information including service association information and the layer 2 signalling information including local multiplex information and other multiplex information, wherein the local multiplex information is related to a first multiplex of a first cell of a network, and the other multiplex information is related to a second multiplex of a second cell of the network and includes a frequency parameter of the second multiplex; locating a physical layer pipe carrying the upper layer signalling information; locating a physical layer pipe carrying at least part of the layer 2 signalling information; extracting the service association information from the physical layer pipe carrying the upper layer signalling information, wherein the service association information includes information associating a uniform resource identifier of a service with one or more component identifiers; extracting the local multiplex information and the other multiplex information from the physical layer pipe carrying said at least part of the layer 2 signalling information, wherein the extracted local multiplex information includes a list of components that are carried within the first multiplex and the extracted other multiplex information includes a list of components that are carried within the second multiplex, and wherein the lists of components include the one or more component identifiers; and storing information related to the extracted service association information, the extracted local multiplex information and the extracted other multiplex information.