Could not resoleve uiRouter and child:/id IONIC app

I've a problem with UI-Router in my ionic app, I don't understand how can I go to state child defined by id using $state.go(state)

this is my stateProvider:

$stateProvider
    .state('tab', {
    url: "/tab",
    abstract: true,
    templateUrl: "templates/tabs.html"
})
    .state('tab.home', {
    url: '/home',
    views: {
        'tab-home': {
            templateUrl: 'templates/tab-home.html',
            controller: 'HomeCtrl'
        }
    }
})
    .state('tab.chats', {
    cache: false,
    url: '/chats',
    views: {
        'tab-chats': {
            templateUrl: 'templates/tab-chats.html',
            controller: 'ChatsCtrl'
        }
    }
})
    .state('tab.chat-detail', {
    url: '/chats/:chatId',
    views: {
        'tab-chats': {
            templateUrl: 'templates/chat-detail.html',
            controller: 'ChatDetailCtrl'
        }
    }
})

from the homeCtrl I would like to go in chats detail. Firstly I used $location(tab/chats/123) but sometimes give me problems..

How can I pass the id using $state.go()?

This is very easy to find in doc $state.go

go(to, params, options)

so, we can do it like this:

$state.go('tab.chat-detail', {chatId : 123 });

small cite from the doc about the second parameter params

A map of the parameters that will be sent to the state, will populate $stateParams. Any parameters that are not specified will be inherited from currently defined parameters. This allows, for example, going to a sibling state that shares parameters specified in a parent state. Parameter inheritance only works between common ancestor states, I.e. transitioning to a sibling will get you the parameters for all parents, transitioning to a child will get you all current parameters, etc.